# ID Title Solved by Difficulty
1100The 3n + 1 problem264851
2102Ecological Bin Packing106082
310071Back to High School Physics95543
410055Hashmat the Brave Warrior94323
5272TEX Quotes81923
6458The Decoder72894
7136Ugly Numbers67294
810038Jolly Jumpers63194
910035Primary Arithmetic62684
1010018Reverse and Add60614
11108Maximum Sum60224
12113Power of Cryptography58045
13494Kindergarten Counting Game57845
14299Train Swapping57525
1510082WERTYU54815
16101The Blocks Problem52255
17591Box of Bricks51135
1810008What's Cryptanalysis?49425
1910300Ecological Premium48395
20575Skew Binary47326
21369Combinations45436
22151Power Crisis44706
23382Perfection43936
2410370Above Average43776
25160Factors and Factorials43146
2610189Minesweeper43036
27579ClockHands42936
28264Count on Cantor42376
29424Integer Inquiry42146
30499What's The Frequency, Kenneth?41946
3110110Light, More Light41896
32541Error Correction40966
33543Goldbach's Conjecture40217
3410004Bicoloring39397
3510107What is the Median?38917
36374Big Mod38767
37686Goldbach's Conjecture (II)38527
38105The Skyline Problem38397
39495Fibonacci Freeze38277
40483Word Scramble37937
4110041Vito's Family37857
4210019Funny Encryption Method37737
43256Quirksome Squares37137
44138Street Numbers36617
4510079Pizza Cutting36277
46530Binomial Showdown36097
4710696f9135527
48111History Grading35337
4910340All in All35018
5010783Odd Sum35008
51476Points in Figures: Rectangles34818
52344Roman Digititis34438
53673Parentheses Balance34368
5410346Peter's Smoke33678
55120Stacks of Flapjacks33598
5610469To Carry or not to Carry33388
5710127Ones33298
58492Pig-Latin32658
59438The Circumference of the Circle32528
6010327Flip Sort32148
61401Palindromes32128
6210050Hartals32118
63103Stacking Boxes32078
64324Factorial Frequencies31918
65146ID Codes31388
66350Pseudo-Random Numbers31159
6710106Product30839
6810222Decode the Mad man30379
6910006Carmichael Numbers30369
70568Just the Facts30339
71440Eeny Meeny Moo30239
72305Joseph29869
7310405Longest Common Subsequence29549
74583Prime Factors29529
75484The Department of Redundancy Department29479
7610302Summation of Polynomials29349
77477Points in Figures: Rectangles and Circles29339
78412Pi28989
79446Kibbles ``n'' Bits ``n'' Bits ``n'' Bits28909
80406Prime Cuts28859
8110260Soundex28489
82640Self Numbers28469
83572Oil Deposits28359
84294Divisors28329
85118Mutant Flatworld Explorers28169
86107The Cat in the Hat27919
87445Marvelous Mazes277510
88112Tree Summing275510
89694The Collatz Sequence274110
90706LCD Display273610
9110013Super long sums270210
92439Knight Moves269910
93443Humble Numbers268010
94674Coin Change264410
9510812Beat the Spread!259610
96371Ackermann Functions257310
97834Continued Fractions256510
98119Greedy Gift Givers255210
9910220I Love Big Numbers !253210
100386Perfect Cubes252910
101167The Sultan's Successors248411
102444Encoder and Decoder247711
103713Adding Reversed Numbers247111
104195Anagram246411
105392Polynomial Showdown245811
10610424Love Calculator245311
107190Circle Through Three Points243011
108291The House Of Santa Claus242511
10910161Ant on a Chessboard241011
110489Hangman Judge237311
111128Software CRC235911
112133The Dole Queue233411
113490Rotating Sentences232311
11410003Cutting Sticks231211
115573The Snail227712
11610098Generating Fast, Sorted Permutation226612
117488Triangle Wave225212
118408Uniform Generator224312
11910324Zeros and Ones222512
12010235Simply Emirp222012
121441Lotto220012
122106Fermat vs. Pythagoras219612
123414Machined Surfaces218112
124623500!217412
12510323Factorial! You Must be Kidding!!!214112
126576Haiku Review213812
127200Rare Order211912
12810209Is This Integration ?211813
12910252Common Permutation211413
13010432Polygon Inside A Circle210813
13110062Tell me the frequencies!210113
132116Unidirectional TSP207613
133536Tree Recovery204613
13410473Simple Base Conversion203413
13510131Is Bigger Smarter?201713
136847A Multiplication Game201213
13710699Count the factors201013
138104Arbitrage200513
13910924Prime Words200413
140417Word Index199213
141156Ananagrams198613
142496Simply Subsets198213
14310409Die Game198213
144478Points in Figures: Rectangles, Circles, Triangles197313
14510530Guessing Game196613
14610929You can say 11196313
147621Secret Research196014
14810195The Knights Of The Round Table196014
14910338Mischievous Children195414
15010066The Twin Towers193514
151130Roman Roulette193314
152352The Seasonal War192914
15310921Find the Telephone192114
154400Unix ls191414
15510579Fibonacci Numbers184914
15610192Vacation184314
15710515Powers Et Al.182914
158117The Postal Worker Rings Once182714
15910000Longest Paths182215
160147Dollars180515
161846Steps180415
16210550Combination Lock180315
163155All Squares179715
164191Intersection179615
16510104Euclid Problem179615
16610499The Land of Justice176215
16710591Happy Number174415
16810137The Trip173315
169122Trees on the level172915
170121Pipe Fitters171415
17110310Dog and Gopher171415
17210193All You Need Is Love169116
17310305Ordering Tasks168916
17410034Freckles167916
175357Let Me Count The Ways165316
176389Basically Speaking165216
17710334Ray Through Glasses163716
17810931Parity163416
17910010Where's Waldorf?161516
180271Simply Syntax160417
18110099The Tourist Guide160417
182300Maya Calendar160117
18310450World Cup Noise159117
184532Dungeon Master159017
185562Dividing coins158517
186514Rails157117
187498Polly the Polynomial156917
188612DNA Sorting156117
18910105Polynomial Coefficients156017
190534Frogger155517
19110282Babelfish155517
192594One Little, Two Little, Three Little Endians154917
193348Optimal Array Multiplication Sequence154617
194442Matrix Chain Multiplication153917
195336A Node Too Far153217
19610015Joseph's Cousin152117
19710789Prime Frequency150718
19810033Interpreter150518
19910168Summation of Four Primes149918
200340Master-Mind Hints149618
201144Student Grants148218
20210042Smith Numbers147718
203154Recycling146018
20410533Digit Primes145618
20510420List of Conquests145518
206109SCUD Busters144618
207740Baudot Data Communication Code143119
20810361Automatic Poetry141819
20910394Twin Primes141719
210216Getting in Line141319
211544Heavy Cargo140619
21210183How Many Fibs?139619
213378Intersecting Lines139519
21410286Trouble with a Pentagon139319
215624CD138319
21610074Take the Land138219
21711000Bee138119
218661Blowing Fuses137419
219109222 the 9s137419
22010116Robot Motion137119
22110608Friends136919
222278Chess136719
22310295Hay Points136519
22410336Rank the Languages135919
225537Artificial Intelligence?135320
22610221Satellites135120
227642Word Amalgamation134920
22810191Longest Nap133920
22911172Relational Operator133420
23010276Hanoi Tower Troubles Again!132320
231587There's treasure everywhere!132120
23210970Big Chocolate132020
233524Prime Ring Problem131620
23410219Find the ways !131620
235343What Base Is This?131120
236516Prime Land131120
23710152ShellSort130020
238315Network129420
239574Sum It Up129220
240567Risk128921
241474Heads / Tails Probability128721
242355The Bases Are Loaded128521
24310049Self-describing Sequence127321
24410070Leap Year or Not Leap Year and ...127221
24510182Bee Maja126721
24610223How many nodes ?126221
247636Squares (III)125021
248202Repeating Decimals124721
24910130SuperSale124521
25010196Check The Check124321
25110190Divide, But Not Quite Conquer!124121
25210198Counting124121
253123Searching Quickly123921
254729The Hamming Distance Problem120722
25510297Beavergnaw120622
25610700Camel trading119522
257320Border118922
258465Overflow118722
259497Strategic Defense Initiative118722
260153Permalex118622
261739Soundex Indexing118122
262637Booklet Printing117723
26310067Playing with Wheels117723
264124Following Orders116923
265409Excuses, Excuses!116923
266423MPI Maelstrom116323
267422Word-Search Wonder115623
268459Graph Connectivity115323
269486English-Number Translator114923
27010026Shoemaker's Problem114623
27110611The Playboy Chimp114023
272253Cube painting113923
27310474Where is the Marble?113523
27410701Pre, in and post113223
27510048Audiophobia112823
276482Permutation Arrays112724
277555Bridge Hands112124
27810509R U Kidding Mr. Feynman!112024
27910077The Stern-Brocot Number System111824
280311Packets111324
28110784Diagonal111324
28210258Contest Scoreboard111124
283485Pascal's Triangle of Death110924
284748Exponentiation110524
285413Up and Down Sequences110324
286531Compromise110224
287558Wormholes110224
28810573Geometry Paradox110224
28910945Mother bear110224
290145Gondwanaland Telecom109424
29110407Simple division109424
29210170The Hotel with Infinite Rooms108624
293114Simulation Wizardry108025
29410025The ? 1 ? 2 ? ... ? n = k problem107825
29510242Fourth Point !!107825
296201Squares107725
29710465Homer Simpson107625
298297Quadtrees107325
299326Extrapolation Using a Difference Table107325
30010102The path in the colored field107125
301170Clock Patience106325
30210179Irreducable Basic Fractions106225
30310162Last Digit106125
304161Traffic Lights105825
305140Bandwidth105325
30610036Divisibility105225
30710487Closest Sums104925
308356Square Pegs And Round Holes104525
309231Testing the CATCHER103726
31010622Perfect P-th Powers103426
31110678The Grazing Cow102826
312784Maze Exploration102726
31310009All Roads Lead Where?102326
31410285Longest Run on a Snowboard101526
31510056What is the Probability ?101026
31610139Factovisors101026
31710347Medians100926
31810489Boxes of Chocolates100926
319639Don't Get Rooked100726
320615Is It A Tree?100626
321836Largest Submatrix100626
32210642Can You Solve It?100326
323539The Settlers of Catan100126
324701The Archeologists' Dilemma100126
32510684The jackpot100126
32610451Ancient Village Sports99427
327115Climbing Trees99327
32810703Free spots99327
32910427Naughty Sleepy Boys98427
33010633Rare Easy Problem98127
331325Identifying Legal Pascal Real Constants97727
332166Making Change97327
333455Periodic Strings97327
334152Tree's a Crowd97127
335275Expanding Fractions97027
336507Jill Rides Again96827
33710408Farey sequences96727
33810502Counting Rectangles96727
33910014Simple calculations96427
340384Slurpys96228
34110093An Easy Problem!96128
342125Numbering Paths95828
343141The Spot Game95828
34410125Sumsets95828
34510229Modular Fibonacci95728
346437The Tower of Babylon95328
347333Recognizing Good ISBNs95228
34810878Decode the tape94928
34910815Andy's First Dictionary94428
35010188Automated Judge Script94028
35110267Graphical Editor94028
352608Counterfeit Dollar93428
353110Meta-Loopless Sorts92829
354193Graph Coloring92429
35510299Relatives91929
356628Passwords91629
35710491Cows and Cars91629
35810365Blocks91429
35910080Gopher II91329
360580Critical Mass91029
361337Interpreting Control Sequences90729
36210020Minimal coverage90229
363164String Computer90029
36410714Ants90029
365377Cowculations89929
36610583Ubiquitous Religions89929
367700Date Bugs89829
36810176Ocean Deep ! - Make it shallow !!89630
369450Little Black Book89030
370436Arbitrage (II)88530
37110490Mr. Azad and his Son!!!!!88430
37210281Average Speed88230
373280Vertex87930
37410007Count the Trees87730
37510140Prime Distance87330
376725Division87130
377793Network Connections87130
37810298Power Strings86930
37910452Marcus, help!86631
38010404Bachet's Game86131
38110100Longest Match85931
38211185Ternary85931
383619Numerically Speaking85431
38410205Stack 'em Up85331
385644Immediate Decodability84931
38610508Word Morphing84931
387542France '9884831
38810673Play with Floor and Ceil84831
389127``Accordian'' Patience84431
390571Jugs84431
391332Rational Numbers from Repeating Fractions84131
39210359Tiling83932
39310078The Art Gallery83832
39410539Almost Prime Numbers83232
395696How Many Knights83132
39610002Center of Masses83032
39710948The primary problem83032
398263Number Chains82432
399353Pesky Palindromes82132
400712S-Trees81932
40110656Maximum Sum (II)81233
40210400Game Show Math81033
403466Mirror, Mirror80733
40410115Automatic Editing80533
405727Equation80333
406129Krypton Factor79933
407448OOPS!79733
40810664Luggage79633
409232Crossword Answers79433
410131The Psychic Poker Player79333
41110129Play on Words78434
41210194Football (aka Soccer)78434
41310081Tight Words78334
41410142Australian Voting78034
41510363Tic Tac Toe78034
41610303How Many Trees?77434
41710397Connect the Campus77334
41810935Throwing cards away I77334
419895Word Problem77234
42010293Word Length and Frequency76735
42110301Rings and Glue76435
422679Dropping Balls76235
423641Do the Untwist76035
424620Cellular Structure75535
42510311Goldbach and Euler75535
426383Shipping Routes75135
42710790How Many Points of Intersection?75135
42810954Add All74636
429126The Errant Physicist74336
43010800Not That Kind of Graph74336
431260Il Gioco dell'X74136
43210415Eb Alto Saxophone Player74036
433227Puzzle73936
43410443Rock, Scissors, Paper73936
435755487--327973836
436913Joana and the Odd Numbers73736
437602What Day Is It?73436
43810940Throwing cards away II73436
439681Convex Hull Finding73036
440301Transportation72936
441306Cipher72537
44210112Myacm Triangles71937
44310341Solve It71737
44410494If We Were a Child Again71737
445585Triangles71637
4467508 Queens Chess Problem71337
44711044Searching for Nessy71337
448850Crypt Kicker II71137
44910315Poker Hands70538
45010852Less Prime70538
45110279Mine Sweeper70438
452394Mapmaker70238
45310496Collecting Beepers70038
45410903Rock-Paper-Scissors Tournament70038
45510283The Kissing Circles69438
456900Brick Wall Patterns69138
457460Overlapping Rectangles69038
458699The Falling Leaves68739
459402M*A*S*H68539
46010037Bridge68439
46110128Queue68439
46210101Bangla Numbers68139
46310693Traffic Volume67939
464825Walking on the Safe Side67739
46510057A mid-summer night's dream.67539
46610063Knuth's Permutation67239
46711059Maximum Product67239
46810069Distinct Subsequences67040
469213Message Decoding66940
470481What Goes Up66640
471785Grid Colouring66540
4721034423 out of 566440
47310377Maze Traversal65940
47410551Basic Remains65840
47511192Group Reverse65540
47610245The Closest Pair Problem65440
47710706Number Sequence65440
478762We Ship Cheap65141
47910141Request for Proposal65041
48010600ACM Contest and Blackout64741
481159Word Crosses64341
48210810Ultra-QuickSort64241
483187Transaction Processing64041
484397Equation Elation64041
485808Bee Breeding64041
486861Little Bishops64041
487188Perfect Hash63941
488331Mapping the Swaps63941
489821Page Hopping63542
49010392Factoring Large Numbers63342
491469Wetlands of Florida63242
492839Not so Mobile63142
493820Internet Bandwidth63042
49411057Exact Sum62942
49510054The Necklace62542
496884Factorial Factors61843
49710375Choose and divide61843
49810976Fractions Again?!61543
49910523Very Easy !!!61343
50010589Area61243
501218Moth Eradication61143
50210519!! Really Strange !!60844
50310368Euclid's Game60444
50410918Tri Tiling60244
50510919Prerequisites?60144
506134Loglan-A Logical Language59744
507142Mouse Clicks59644
508391Mark-up59445
50910719Quotient Polynomial59445
51010177(2/3/4)-D Sqr/Rects/Cubes/Boxes?59345
51110730Antiarithmetic?59245
512254Towers of Hanoi58745
51310534Wavio Sequence58545
514148Anagram checker58445
515651Deck58445
516626Ecosystem58345
51710683The decadary watch58246
518435Block Voting58146
51910943How do you add?58146
52011121Base -258146
521630Anagrams (II)58046
522634Polygon57946
52310500Robot maps57946
524737Gleaming the Cubes57746
52510360Rat Attack57646
52610287Gifts in a Hexagonal Box57546
527711Dividing up57346
528183Bit Maps57146
52936218,000 Seconds Remaining57046
53010051Tower of Cubes57046
531132Bumpy Objects56947
53210165Stone Game56847
53310213How Many Pieces of Land ?56447
53410369Arctic Network56447
53510916Factstone Benchmark56447
53610905Children's Game56247
537416LED Test56147
53810012How Big Is It?56147
53910879Code Refactoring56047
540540Team Queue55947
54110566Crossed Ladders55847
54210702Travelling Salesman55648
543880Cantor Fractions55448
544429Word Transformation55348
54510596Morning Walk55148
54610249The Grand Dinner55048
54710422Knights in FEN55048
548535Globetrotter54848
54910001Garden of Eden54748
55010326The Polynomial Equation54748
551703Triple Ties: The Organizer's Nightmare54649
552184Laser Lines54449
55310493Cats, with or without Hats54449
55410393The One-Handed Typist54249
55511005Cheapest Base53949
556379Hi-Q53849
557617Nonstop Travel53749
558714Copying Books53649
55910065Useless Tile Packers53649
56011063B2-Sequence53649
56110016Flip-Flop the Squarelotron53450
56210651Pebble Solitaire53450
56310803Thunder Mountain53450
56410364Square53250
56511069A Graph Problem53250
566601The PATH53050
56710813Traditional BINGO53050
568434Matty's Blocks52950
56910680LCM52750
57010930A-Sequence52750
57110653Bombs! NO they are Mines!!52650
57210210Romeo and Juliet !52550
57310926How Many Dependencies?52550
57411040Add bricks in the wall52550
57510199Tourist Guide52351
57610908Largest Square52351
577550Multiplying by Rotation52151
578590Always on the run51651
579208Firetruck51551
58010374Election51452
58110667Largest Block51452
58210200Prime Time51352
58310330Power Transmission51252
58410518How Many Calls?51152
58510147Highways51052
586273Jack Straws50852
587347Run, Run, Runaround Numbers50852
58810910Marks Distribution50852
58910061How many zero's and how many digits ?50652
59010088Trees on My Island50652
591855Lunch in Grid City50552
59210849Move the bishop50552
59310507Waking up brain50253
59410946You want what filled?50253
595165Stamps50153
596454Anagrams50153
59710306e-Coins50153
598327Evaluating Simple C Expressions49953
59910171Meeting Prof. Miguel...49853
60010791Minimum Sum LCM49753
60110044Erdos Numbers49653
60210763Foreign Exchange49554
603688Mobile Phone Coverage49454
60410739String to Palindrome49354
60510880Colin and Ryan49054
60610780Again Prime? No Time.48954
60710371Time Zones48854
608843Crypt Kicker48555
60910620A Flea on a Chessboard48555
610318Domino Effect48355
611471Magic Numbers48255
61210602Editor Nottobad48155
61311074Draw Grid48155
6141101505-2 Rendezvous47955
615186Trip Routing47855
61610391Compound Words47756
61710484Divisibility of Factors47756
618381Making the Grade47656
619677All Walks of length ``n'' from the first node47656
62010446The Marriage Interview :-)47656
62110773Back to Intermediate Math47656
622255Correct Move47556
62310527Persistent Numbers47556
62410202Pairsumonious Numbers47456
62510497Sweet Child Makes Trouble47456
626457Linear Cellular Automata47356
627556Amazing47356
628741Burrows Wheeler Decoder47256
629796Critical Links47256
63010304Optimal Binary Search Tree47156
631743The MTM Machine47056
63210689Yet another Number Sequence46956
633526String Distance and Transform Process46757
63410268498-bis46757
63510271Chopsticks46757
636162Beggar My Neighbour46557
63710126Zipf's Law46557
638627The Net46457
639584Bowling46257
64010705The Fun Number System46257
64110522Height to Area46058
64211001Necklace46058
64311150Cola45958
64410738Riemann vs Mertens45858
645705Slash Maze45758
64610820Send a Table45758
647622Grammar Evaluation45658
64810928My Dear Neighbours45658
649245Uncompress45458
650314Robot45458
65110005Packing polygons45458
65210617Again Palindrome45159
653638Finding Rectangles45059
654704Colour Hash45059
65510060A hole to catch a man45059
65610669Three powers45059
65710920Spiral Tap44959
658143Orchard Trees44859
659538Balancing Bank Accounts44659
66010132File Fragmentation44460
66110650Determinate Prime44460
662517Word44260
663551Nesting a Bunch of Brackets44260
664588Video Surveillance44060
66510307Killing Aliens in Borg Maze44060
66610309Turn the Lights Off43960
667586Instant Complexity43860
66810801Lift Hopping43860
66910090Marbles43761
67010354Avoiding Your Boss43661
67110925Krakovia43661
672168Theseus and the Minotaur43561
673209Triangular Vertices43561
674468Key to Success43461
675547DDF43361
67610022Delta-wave43261
67710721Bar Codes43261
67810337Flight Planner43161
67910460Find the Permuted String43161
68010865Brownie Points43161
681196Spreadsheet42862
68210233Dermuba Triangle42862
68310226Hardwood Species42762
68410871Primed Subsequence42662
68511039Building designing42562
686222Budget Travel42462
68710197Learning Portuguese42263
688290Palindroms <---> smordnilaP42063
68910120Gift?!42063
690756Biorhythms41963
691654Ratio41863
692833Water Falls41863
69310178Count the Faces.41764
69410503The dominoes solitaire41764
69511137Ingenuous Cubrency41764
69610541Stripe41564
69710154Weights and Measures41464
698418Molecules41364
699632Compression (II)41364
70010227Forests41264
701647Chutes and Ladders41164
702462Bridge Hand Evaluator41065
703296Safebreaker40965
704380Call Forwarding40965
70511219How old are you?40965
706501Black Box40865
707598Bundling Newspapers40865
70810896Known Plaintext Attack40765
709270Lining Up40366
71010201Adventures in Moving - Part IV40366
71110308Roads in the North40366
71210290{Sum+=i++} to Reach N40266
71310356Rough Roads40266
714321The New Villa40166
71510774Repeated Josephus40066
71610994Simple Addition39966
717177Paper Folding39767
718403Postscript39767
71910554Calories from Fat39567
72010092The Problem with the Problem Setter39367
72110325The Lottery39367
722616Coconuts, Revisited39268
723763Fibinary Numbers39068
724393The Doors38968
72510677Base Equality38968
72610776Determine The Combination38968
727815Flooded!38868
728220Othello38768
72911152Colourful Flowers38768
73010254The Priest Mathematician38669
731157Route Finding38569
73210284Chessboard in FEN38569
73310892LCM Cardinality38469
734139Telephone Tangles38269
73510453Make Palindrome38269
73610646What is the Card?38269
73710717Mint38269
73810585Center of symmetry38170
73910440Ferry Loading II37670
74011078Open Credit System37471
74110113Exchange Rates37371
74210312Expression Bracketing37371
743172Calculator Language37271
74411089Fi-binary Number37072
74510029Edit Step Ladders36972
74610543Traveling Politician36972
74710610Gopher and Hawks36972
748313Intervals36772
749897Anagrammatic Primes36573
750670The dog task36473
75110959The Party, Part I36373
752665False coin36273
75310625GNU = GNU'sNotUnix36273
75411105Semi-prime H-numbers36273
755702The Vindictive Coach36173
75610150Doublets35974
75710856Recover Factorial35974
75810387Billiard35874
759341Non-Stop Travel35774
76010603Fill35774
76110963The Swallowing Ground35774
762812Trade on Verweggistan35674
763108512D Hieroglyphs decoder35674
76410894Save Hridoy35575
76510174Couple-Bachelor-Spinster Numbers.35475
76610313Pay the Price35475
76711115Uncle Jack35475
768137Polygons35375
769345It's Ir-Resist-Able!35375
7701018115-Puzzle Problem35375
77110806Dijkstra, Dijkstra.35375
77211220Decoding the message.35375
77311068An Easy Task35275
774181Hearts35175
77510718Bit Mask35175
776657The die is cast35076
77710401Injured Queen Problem35076
77811076Add Again35076
77911067Little Red Riding Hood34876
78010891Game of Sum34776
781614Mapping the Route34577
78210637Coprimes34577
78310679I Love Strings!!34577
78411173Grey Codes34577
785493Rational Spiral34277
78610986Sending email34277
78710912Simple Minded Hashing34178
78811056Formula 134178
789545Heads33978
79010212The Last Non-zero Digit.33978
79110672Marbles on a tree33978
79210895Matrix Transpose33978
793548Tree33878
794871Counting Cells in a Blob33878
79511085Back to the 8-Queens33779
796427FlatLand Piano Movers33679
797710The Game33679
79811003Boxes33679
799388Galactic Import33579
800339SameGame Simulation33479
80110586Polynomial Remains33280
80210947Bear with me, again..33280
80311151Longest Palindrome33180
80411054Wine trading in Gergovia33080
80510616Divisible Group Sums32881
806349Transferable Voting (II)32781
80710382Watering Grass32781
80810576Y2K Accounting Bug32781
80910742The New Rule in Euphomia32781
81010047The Monocycle32681
81110482The Candyman Can32681
812776Monkeys in a Regular Forest32581
81310520Determine it32581
81410578The Game of 3132581
815668Parliament32482
816589Pushing Boxes32382
817732Anagrams by Stack32382
81810075Airlines32382
819150Double Time32282
820135No Rectangles32083
82110528Major Scales32083
82210830A New Function32083
823447Population Explosion31983
824565Pizza Anyone?31883
82511064Number Theory31883
82610670Work Reduction31784
82710978Let's Play Magic!31784
828557Burger31684
82910259Hippity Hopscotch31684
83010406Cutting tabletops31684
83110842Traffic Flow31684
832179Code Breaking31584
833865Substitution Cypher31484
83411042Complex, difficult and complicated31484
83511244Counting Stars31385
83610911Forming Quiz Teams31185
83711012Cosmic Cabbages31185
838302John's trip31085
839892Finding words31085
84010532Combination! Once Again31085
84110536Game of Euler31085
84210662The Wedding31085
84310720Graph Construction31085
844467Synching Signals30986
84510635Prince and Princess30986
84610296Jogging Trails30886
84710991Region30786
848520Append30687
84910574Counting Rectangles30587
85011233Deli Deli30587
851533Equation Solver30487
85210058Jimmi's Riddles30487
85310264The Most Potent Corner30487
85410333The Tower of ASCII30487
85510821Constructing BST30487
85610017The Never Ending Towers of Hanoi30387
85710261Ferry Loading30288
85811062Andy's Second Dictionary30188
85911207The easiest way30188
860633A Chess Knight30088
86110250The Other Two Trees30088
86210681Teobaldo's Trip30088
863993Product of digits29989
86410097The Color Game29989
86510862Connect the Cable Wires29989
86611045My T-shirt suits me29889
86710094Place the Guards29789
86811223O: dah dah dah!29789
869338Long Multiplication29689
870521Gossiping29689
87110167Birthday Cake29689
87210217A Dinner with Schwarzenegger!!!29689
87310555Dead Fraction29689
87410351Cutting Diamonds29590
87510083Division29490
87610203Snow Clearing29490
877171Car Trialling29291
87810957So Doku Checker29291
879276Egyptian Multiplication28992
88010771Barbarian tribes28992
881242Stamps and Envelope Size28892
88210164Number Game28892
88310785The Mad Numerologist28892
88411222Only I did it!28892
88510410Tree Reconstruction28792
88610466How Far?28792
887346Getting Chorded28693
888529Addition Chains28693
88910685Nature28593
89011086Composite Prime28593
891185Roman Numerals28493
892753A Plug for UNIX28493
893824Coast Tracker28493
89410158War28493
89510564Paths through the Hourglass28394
89610480Sabotage28294
897428Swamp County Roofs28095
898662Fast Food28095
899718Skyscraper Floors28095
900385DNA Translation27995
901523Minimum Transport Cost27995
90210232Bit-wise Sequence27995
903518Time27895
90410146Dictionary27895
905735Dart-a-Mania27796
90610557XYZZY27796
90710562Undraw the Trees27796
90810759Dice Throwing27696
909410Station Balance27596
91010187From Dusk Till Dawn27596
91111058Encoding27596
91210043Chainsaw Massacre27497
91310263Railway27497
91411093Just Finish it up27497
915452Project Scheduling27397
91610257Dick and Jane27397
91710634Say NO to Memorization27397
91810716Evil Straw Warts Live27397
919375Inscribed Circles and Isosceles Triangles27297
92010787Modular Equations27297
92110792The Laurel-Hardy Story27297
92210823Of Circles and Squares27297
92310510Cactus27198
92410328Coin Toss27098
925603Parking Lot26998
92610964Strange Planet26998
927308Tin Cutter26899
928604The Boggle Game26799
92910668Expanding Rods26799
930178Shuffling Patience266100
931433Bank (Not Quite O.C.R.)266100
93210419Sum-up the Primes266100
93310666The Eurocup is Here!266100
93410733The Colored Cubes266100
93510396Vampire Numbers265100
93610855Rotated square265100
937211The Domino Effect264100
938613Numbers That Count264100
93910495Conic Distance264100
94010626Buying Coke264100
94110902Pick-up Sticks264100
94211110Equidivisions264100
943198Peter's Calculator263101
94410917Walk Through the Forest263101
945592Island of Logic262101
94610814Simplifying Fractions262101
947837Light and Transparencies261101
94810111Find the Winning Move261101
94910428The Roots261101
95011029Leading and Trailing261101
95111221Magic square palindromes.261101
95210039Railroads259102
953158Calendar258103
954852Deciding victory in Go258103
95510505Montesco vs Capuleto258103
95610350Liftless EME257103
95710567Helping Fill Bates257103
95810816Travel in Desert257103
95910827Maximum sum on a torus257103
96010318Security Panel256103
96111100The Trip, 2007256103
962599The Forrest for the Trees255104
96310439Temple of Dune254104
964230Borrowers253105
96510804Gopher Strategy253105
96610898Combo Deal253105
967395Board Silly252105
968671Spell checker252105
96911038How Many O's?252105
97011055Homogeneous squares252105
971745Numeric Puzzles Again!251106
97210874Segments251106
973948Fibonaccimal Base250106
97410278Fire Station248107
97510843Anne's game248107
976174Strategy246108
977257Palinwords246108
978561Jackpot246108
979845Gas Station Numbers245108
98010316Airline Hub245108
98110506The Ouroboros problem245108
982487Boggle Blitz244109
98310040Ouroboros Snake244109
984303Pipe243109
985307Sticks243109
98610246Asterix and Obelix243109
987974Kaprekar Numbers242109
98810688The Poor Giant242109
989563Crimewave241110
99010560Minimum Weight241110
99111026A Grouping Problem241110
992759The Return of the Roman Empire240110
99310504Hidden squares240110
99411133Eigensequence240110
99510980Lowest Price in Town238111
996405Message Routing237112
99710317Equating Equations237112
99810357Playball !!!237112
99910547Hidden Truth in Recurrence237112
1000707Robbery236112
100110218Let's Dance !!!235113
100210416Folding My T-Shirt235113
100311060Beverages235113
1004215Spreadsheet Calculator234113
1005505Moscow time234113
1006869Airline Comparison234113
100710215The Largest/Smallest Box ...234113
1008192Synchronous Design233114
1009519Puzzle (II)233114
101010944Nuts for nuts..232114
101111002Towards Zero232114
101210793The Orc Attack231115
101310942Can of Beans231115
101410086Test the Rods230115
101510722Super Lucky Numbers230115
101610745Dominant Strings230115
101710483The Sum Equals the Product229116
101810901Ferry Loading III229116
1019652Eight228116
102010023Square root228116
102110339Watching Watches228116
102210389Subway228116
102310421Critical Wave228116
102410900So you want to be a 2n-aire?228116
102510915War on Weather228116
102611103WFF 'N PROOF228116
1027425Enigmatic Encryption227117
102810349Antenna Placement227117
102910593Kites227117
103010425Mobile Destroyer226117
103110819Trouble of 13-Dots226117
1032787Maximum Sub-sequence Product225118
103310180Rope Crisis in Ropeland!225118
103410288Coupons225118
103510655Contemplation - Algebra225118
1036274Cat and Mouse224118
103710243Fire! Fire!! Fire!!!224118
1038618Doing Windows222119
103911049Basic wall maze222119
104011108Tautology222119
1041298Race Tracks220120
104210977Enchanted Forest220120
1043902Password Search219121
104410537The Toll! Revisited219121
104510710Chinese Shuffle219121
104611022String Factoring219121
1047268Double Trouble218121
1048672Gangsters218121
104910085The most distant state218121
105011203Can you decide it for ME?218121
105110021Cube in the labirint217122
105210390Bean Counting217122
105310535Shooter217122
1054658It's not a Bug, it's a Feature!216123
1055726Decode216123
105610329Combinatorial Expression216123
105710462Is There A Second Way Left?216123
105810549Russian Dolls216123
105910423Peter Takes a Tramway215123
106010477The Hybrid Knight215123
1061415Sunrise214124
1062432Modern Art214124
106310149Yahtzee214124
106410320Cow Trouble! Help Please!!214124
1065182Bonus Bonds213124
106610433Automorphic Numbers213124
106710449Traffic213124
106810459The Tree Root213124
106910570Meeting with Aliens213124
107010598Find the Latitude213124
107110777God! Save me213124
107210854Number of Paths213124
107311034Ferry Loading IV213124
107410024Curling up the cube212125
107510471Can't be too GREEDY212125
107610990Another New Function212125
1077914Jumping Champion211126
107810540Flowers of a Beautiful Mind211126
107911048Automatic Correction of Misspellings211126
1080387A Puzzling Problem210126
108110118Free Candies210126
108210378Complex Numbers210126
108311231Black and white painting210126
1084451Poker Solitaire Evaluator209127
108510385Duathlon209127
108610746Crime Wave - The Sequel209127
108710577Bounding box208127
108810897Travelling Distance208127
1089858Berry Picking207128
1090312Crosswords (II)206129
109110277Boastin' Red Socks206129
109210445Make Polygon206129
1093570Stats205129
1094810A Dicey Problem205129
109510342Always Late205129
109610517Wind of Change!205129
109710769Pillars205129
109810958How Many Solutions?205129
109911226Reaching the fix-point.205129
110010386Circles in Triangle204130
110111070The Good Old Times204130
110210134AutoFish203130
110310157Expressions203130
110410475Help the Leaders203130
110510545Maximal Quadrilateral203130
1106656Optimal Programs202131
110710436Cheapest way201132
110810609Fractal201132
110910761Broken Keyboard201132
1110464Sentence/Phrase Generator200132
111110660Citizen attention offices200132
111210690Expression Again200132
111311004Changing Roadmap200132
111410343Base64 Decoding199133
111510488Swimming Gopher199133
111610938Flea circus199133
111711088End up with More Teams199133
1118719Glass Beads198134
111910464Big Big Real Numbers198134
1120760DNA Sequencing197134
112110114Loansome Car Buyer197134
112211130Billiard bounces197134
1123358Don't Have A Cow, Dude196135
1124607Scheduling Lectures196135
112510269Adventure of Super Mario196135
112610604Chemical Reaction196135
112710734Triangle Partitioning196135
112810927Bright Lights196135
112910214Trees in a Wood.195136
113010444Multi-peg Towers of Hanoi195136
113110698Football Sort195136
113210858Unique Factorization195136
113310247Complete Tree Labeling194137
113410933Volleyball194137
113510998Flipping Colors194137
113610068The Treasure Hunt193137
113710348Submarines193137
113810913Walking on a Grid193137
113911094Continents193137
114011155Be Efficient193137
114110173Smallest Bounding Rectangle192138
114210556Biometrics192138
1143309FORCAL191139
114410160Servicing Stations191139
114510992The Ghost of Programmers191139
114610175Sphere190139
114710934Dropping water balloons190139
1148247Calling Circles189140
114910138CDVII189140
115010426Knights' Nightmare189140
115110544Numbering the Paths189140
115210860Many a Little makes a Mickle189140
115310872Triangles189140
115411080Place the Guards189140
1155149Forests188141
1156782Contour Painting188141
1157411Centipede Collisions187142
1158721Invitation Cards187142
115910512A Day in Math-land187142
116010587Mayor's posters187142
116110624Super Number187142
116211099Next Same-Factored187142
116310032Tug of War186142
116410144Expression186142
116510529Dumb Bones186142
116610999Crabbles186142
116711111Generalized Matrioshkas186142
1168685Least Path Cost185143
116911204Musical instruments185143
1170559Squares (II)184144
1171653Gizilch184144
1172967Circular184144
117310802Lex Smallest Drive184144
117410136Chocolate Chip Cookies183145
117510331The Flyover Construction183145
117610461Difference182146
117710027Language Cardinality181146
117810687Monitoring the Amazon180147
117910728Help!180147
1180866Intersecting Line Segments179148
118110236The Fibonacci Primes179148
118210516Another Counting Problem179148
1183593MBone178149
1184659Reflections178149
118510169Urn-ball Probabilities !178149
118610238Throw the Dice178149
118710275Guess the Number!178149
118810563Least Squares178149
118910479The Hendrie Sequence177150
119010569Number Theory177150
119110889The Lost Gift177150
119211077Find the Permutations177150
1193180Eeny Meeny176150
1194552Filling the Gaps176150
119510831Gerg's Cake176150
1196625Compression175151
119710352Count the eWords175151
119810514River Crossing175151
1199194Triangle174152
1200335Processing MX Records174152
1201893Y3K Problem174152
120210750Beautiful Points174152
120310914Abundance and Perfect Numbers174152
1204366Cutting Up173153
1205610Street Directions173153
120610366Faucet Flow173153
120710072Bob Laptop Woolmer and Eddie Desktop Barlow172154
120810239The Book-shelver's Problem172154
120911132Dice from pennies172154
1210991Safe Salutations171155
121110442Basic171155
121211087Divisibility Testing171155
121310228Star not a Tree?170156
1214259Software Allocation169157
121510237Bishops169157
121610553Treasure Map169157
121710950Bad Code169157
1218811The Fortified Forest168158
121910883Supermean168158
1220684Integral Determinant167159
122110649Danger Point167159
122210709Intersection is Not that Easy167159
122311230Annoying painting tool167159
122411241Humidex167159
122510868Bungee Jumping166160
122610882Koerner's Pub166160
122711028Sum of Product166160
1228635Clock solitaire165161
122910731Test165161
123011053Flavius Josephus Reloaded165161
123111218KTV165161
123211236Grocery store165161
1233173Network Wars164161
123410454Trexpression164161
123510575Polylops164161
123610932Calculator164161
123710123No Tipping163162
123810441Catenyms163162
123910581Partitioning for fun and profit163162
124010744The Optimal Super-Highway163162
1241328The Finite State Text Processing Machine162163
124210559Blocks162163
124311202The least possible effort162163
124411240Antimonotonicity162163
1245399Another Puzzling Problem161165
124610875Big Math161165
1247407Gears on a Board160166
124810658ReArrange160166
124910848Make Palindrome Checker160166
1250334Identifying Concurrent Events159167
125110367Equations159167
125210694Combinatorial Summation159167
1253169Xenosemantics158168
125410648Chocolate Box157169
125510713Map157169
125610877Diceoids157169
125711254Consecutive Integers157169
125810291Cut the Legs155171
125910355Superman155171
126010542Hyper-drive155171
126110870Recurrences155171
126210987Antifloyd155171
126310091The Valentine's Day154172
126410225Discrete Logging154172
126510582ASCII Labyrinth154172
126610850The Gossipy Gossipers Gossip Gossips154172
126710937Blackbeard the Pirate154172
1268500Table153173
126910592Freedom Fighter153173
127011008Antimatter Ray Clearcutting153173
127111024Circular Lock153173
127211148Moliu Fractions153173
127311161Help My Brother (II)153173
1274430Swamp County Supervisors152174
127510045Echo152174
127610256The Great Divide152174
127711101Mall Mania152174
1278221Urban Elevations151175
127910973Triangle Counting151175
128011051Dihedral groups151175
128111158Elegant Permuted Sum151175
128211232Cylinder151175
1283856The Vigenère Cipher150177
128410230Savage Garden150177
128510244First Love !!!150177
128610413Crazy Savages150177
128710606Opening Doors150177
128811032Function Overloading150177
128911170Cos(NA)150177
1290645File Mapping149178
129110234Frequent Substrings149178
129211138Nuts and Bolts149178
129311140Little Ali's Little Brother!149178
1294175Keywords148179
129510741Magic Cube148179
129610822Planet of the Rock, Paper and Scissors148179
1297680Movement of Reading Head147180
129810373The Brick Stops Here147180
129910740Not the Best147180
130010982Troublemakers147180
130111239Open Source147180
1302419Matching Meetings146181
130311027Palindromic Permutation146181
1304390Letter Sequence Analysis145183
130510659Fitting Text into Slides145183
1306107072D-Nim145183
130710832Yoyodyne145183
130811246K-Multiple Free set145183
1309163City Directions144184
1310757Gone Fishing144184
131110890Maze144184
131211227The silver bullet.144184
131311242Tour de France144184
1314426Fifth Bank of Swamp County143185
1315716Commedia dell' arte143185
131611136Hoax or what143185
131711147KuPellaKeS BST143185
1318924Spreading The News142187
131910124Subway142187
132010909Lucky Number142187
1321669Defragment141188
1322736Lost in Space141188
132310294Arif in Dhaka (First Love Part 2)141188
132410412Big Big Trees141188
1325860Entropy Text Analyzer140189
132610011Where Can You Hide?140189
132710398The Golden Pentagon140189
132811112Babylonian Roulette140189
1329189Pascal Program Lengths139191
1330361Cops and Robbers139191
1331453Intersecting Circles139191
133210148Advertisement139191
133310468Rigid Circle Packing139191
133410807Prim, Prim.139191
1335663Sorting Slides138192
133610590Boxes of Chocolates Again138192
133711225Tarot scores.138192
1338560Magic137193
133910723Cyborg Genes137193
134010732The Strange Research137193
134111072Points137193
1342176City Navigation136195
1343250Pattern Matching Prelims136195
134410084Hotter Colder136195
134510372Leaps Tall Buildings (in a single bound)136195
134610430Dear GOD, Pardon Me136195
134710457Magic Car136195
134810511Councilling136195
134910619Advanced Causal Measurements136195
135011096Nails136195
135110251Min-Max Cake135196
135210486Mountain Village135196
135310548Find the Right Changes135196
135410552Genealogical Research135196
135511181Probability|Given134198
1356708Dreisam Equations133199
135710319Manhattan133199
135810525New to Bangladesh?133199
135910724Road Construction133199
136010888Warehouse133199
136110273Eat or Not to Eat?132201
136210571Products132201
136311021Tribles132201
136411127Triple-Free Binary Strings132201
1365566Adam's Genes131202
1366828Deciphering Messages131202
136710417Gift Exchanging131202
136810644Floor Tiles131202
136911083Zeroes Revisited131202
137011180Base i-1131202
1371449Majoring in Scales130204
1372515King130204
1373872Ordering130204
137410697Firemen barracks130204
137511237Halloween treats130204
1376795Sandorf's Cipher129205
137710076The Bumpy Robot129205
137810388Snap129205
137910643Facing Problem With Trees129205
138010989Bomb, Divide and Conquer129205
138110156Sala-ma-Sond, A Nice Little Pond128207
1382697Jack and Jill127209
1383758The Same Game127209
138410652Board Wrapping127209
138510715Cat127209
138611247Income Tax127209
1387239Tempus et mobilius. Time and motion126210
1388554Caesar Cypher126210
138910568n Group k126210
139010725Triangular Square126210
139111129An antiarithmetic permutation126210
139211149Power of Matrix126210
1393835Square of Primes125212
1394844Pousse125212
139510594Data Flow125212
139610747Maximum Subsequence125212
139710825Anagram and Multiplication125212
139810923Seven Seas125212
1399240Variable Radix Huffman Encoding124214
1400962Taxicab Numbers124214
140110089Repackaging124214
140211047The Scrooge Co Problem124214
1403926Walking Around Wisely123215
140411258String Partition123215
1405258Mirror Maze122217
140610476Spam or Not Spam122217
140710599Robots(II)122217
140811234Expressions122217
1409553Simply proportion121219
1410775Hamiltonian Cycle121219
141110601Cubes121219
141210817Headmaster's Headache121219
141311125Arrange Some Marbles121219
141411205The broken pedometer121219
1415751Triangle War120221
141610654The Uxuhul Voting System120221
141710145Lock Manager119223
141810207The Unreal Tournament119223
141910663Non-Powerful Subsets119223
142010692Huge Mods119223
142110748Knights Roaming119223
1422695Placing the Ops118224
142310799OOPS! They did it Again...118224
142410887Concatenation of Languages118224
142511106Rectilinear Polygon118224
1426319Pendulum117226
1427491Tile Topology117226
142810186Euro Cup 2000117226
142910345Cricket/Football Goes Down117226
143010735Euler Circuit117226
1431660Going in circles on Alpha Centauri116228
143210163Storage Keepers116228
143310248The Integer All-time Champ116228
143410561Treblecross116228
143510621Jack and Jill116228
143610665Diatribe against Pigeonholes116228
143710764Signed-digit numbers116228
143810844Bloques116228
143911235Frequent values116228
144010253Series-Parallel Networks115230
144110262Suffidromes115230
144210615Rooks115230
144310708Cheetah115230
1444373Romulan Spelling114232
1445709Formatting Text114232
1446734The Programmer's Hex114232
1447765References114232
144810028Demerit Points114232
144910172The Lonesome Cargo Distributor114232
145011092IIUC HexWorld114232
145110623Thinking Backward113234
145211134Fabled Rooks113234
1453323Jury Compromise112236
1454648Stamps (II)112236
1455830Shark112236
145610208Liar or Not Liar that is the...112236
145710726Coco Monkey112236
145811036Eventually Periodic Sequence112236
1459577WIMP111239
1460851Maze111239
146110255The knight's Tour111239
146210292The Gossiping System111239
146310788Parenthesizing Palindromes111239
146411011Numerical Methods! A Satire111239
1465698Index110241
1466882The Mailbox Manufacturers Problem110241
1467989Su Doku110241
146810053Envelopes110241
146910117Nice Milk110241
147010953Stochastic Digit Generator110241
147111159Factors and Multiples110241
1472512Spreadsheet Tracking109243
1473629Test109243
147410381The Rock109243
147511122Tri Tri109243
1476527The partition of a cake108245
1477903Spiral of Numbers108245
147810280Old Wine Into New Bottles108245
147910384The Wall Pushers108245
148010546The Eagle's Nest108245
148110765Doves and bombs108245
148210782Send More Money108245
1483754Treasure Hunt107248
1484911Multinomial Coefficients107248
148510558A Brief Gerrymander107248
148610595Knight on the Bee Board106250
148710906Strange Integration106250
148810993Ignoring Digits106250
1489907Winterim Backpacking Trip105252
149010321Polygon Intersection105252
149110463Aztec Knights105252
149210686SQF Problems105252
149310772Rose windows105252
149411157Dynamic Frog105252
1495420Supercomputer Selection, The Sequel104255
1496838Worm World104255
149710211Divisibility Testing! Wow!103257
1498261The Window Property102260
1499600A Duckpin Tournament102260
150010448Unique World102260
150110818Dora Trip102260
150211200Sapitaur's labyrinth102260
1503664Single-Player Games101262
150410866Magic Bitstrings101262
150511035Card Hands101262
1506609Metal Cutting100265
1507682Whoever-pick-the-last-one-lose100265
1508766Sum of powers100265
150910353Circles in Hexagon :-)100265
151010376Snakes100265
151110838The Pawn Chess100265
151210122Mysterious Mountain99268
151310647Optimal House Placement99268
151410985Rings'n'Ropes99268
151511090Going in Cycle!!99268
1516199Partial differential equations98270
1517715Substitution Cipher98270
1518783Trains98270
151910661The Perspectographer98270
152010881Piotr's Ants98270
1521814The Letter Carrier's Rounds97273
152211191Square97273
1523197Cube96276
1524840Deadlock Detection96276
1525988Many Paths, One Destination96276
152610185Phylogenetic Trees Inherited96276
152710751Chessboard96276
152810805Cockroach Escape Networks96276
152910835Playing with Coins96276
153011081Strings96276
1531790Head Judge Headache95279
153210811Up the Ante95279
1533277Cabinets94282
153410087The Tajmahal of ++Y2k94282
153510265Toroidal Chess Queens' Problem94282
153610794The Deadly Olympic Returns!!!94282
153710824Regular Polygon94282
153810979How Many Triangles?94282
1539330Inventory Maintenance93285
1540503Parallelepiped walk93285
154110184Equidistance93285
154210434Working With Specific Gravity93285
154310968KuPellaKeS93285
154411020Efficient Solutions93285
154511104Cousins93285
1546316Stars92288
1547870Intersecting Rectangles92288
154810418Hyper Toy Soldiers92288
154910755Garbage Heap92288
155010166Travel91291
155110839The Curse of Barbosa91291
155210956Prime Suspect91291
1553404Radar Scopes90294
1554606Keeps Going and Going and ...90294
1555799Safari Holiday90294
155610399Optimus Prime90294
155710962Don Giovanni's Last Dinner90294
155810997Medals90294
1559502DEL command89298
1560676Horse Step Maze89298
1561752Unscrambling Images89298
1562817According to Bartjens89298
156310362Trains89298
156410627Infinite Race89298
156510768Planarity89298
156611082Matrix Decompressing89298
156711228Transportation system.89298
156811201The problem of the crazy linguist88301
156910743Blocks on Blocks87304
157011186Circum Triangle87304
157139818-Wheeler Caravans (aka Semigroups)86308
157210597Right Words86308
1573317Hexagon85312
1574421Polygonal Puzzle85312
1575848Fmt85312
157610607Siege85312
157710936Land surveyor's job85312
157811131Close Relatives85312
1579722Lakes84315
1580738A Logical Problem84315
1581910TV game84315
158210231Matrix World84315
158310524Matrix Reloaded84315
158410704Traffic!84315
1585288Arithmetic Operations With Large Integers83319
1586431Trial of the Millennium83319
1587689Napoleon's Grumble83319
1588899Colour Circles83319
1589927Integer Sequences from Addition of Terms83319
159010456Intelligent Cats83319
1591832Financial Risk82323
159210216The Optimal Coffee Shop!!82323
159310240The n-Dimensional Cities82323
1594226MIDI Preprocessing81327
1595857Quantiser81327
159610030Computer Dialogue81327
159710379Pit Stop Strategy81327
159810614Dreadful Vectors81327
159910983Buy one, get the rest free81327
160011162Independent Attacking Zones81327
160111164Kingdom Division81327
160211174Stand in a Line81327
1603310L--system80331
1604806Spatial Structures80331
160510618Tango Tango Insurrection80331
160611195Another n-Queen Problem80331
1607376More Triangles ... THE AMBIGUOUS CASE79335
1608929Number Maze79335
160910133Audubon's Stormy Arctic Trip79335
161010270Bigger Square Please...79335
161110437Playing With Fraction79335
161210645Menu79335
161311031Looking for a Subset79335
161411182Zeroes III79335
1615928Eternal Truths78340
161610795A Different Task78340
161711013Get Straight78340
161811052Economic phone calls78340
161924610-20-3077344
1620595A Major Problem76348
1621920Sunny Mountains76348
162210274Fans and Gems76348
162310332The Absent Minded Professor76348
162410431Normal Distribution76348
162510736Series of PI76348
162610775Mystical Matrix76348
162710826Hot or Cold?76348
162810841Lift Hopping in the Real World76348
162911184Joyful Ride76348
163010526Intellectual Property74358
163110779Collectors Problem74358
163211043Fast and Easy Data Compressor74358
163311166Power Signs74358
163410159Star73363
163510754Fantastic Sequence73363
1636229Scanner72368
1637267Of(f) Course!72368
1638692BUT We Need a Diagram72368
163910380Shogi Tournament72368
164010640Planes around the World72368
164110873Splat, Inc.72368
164210995Educational Journey72368
164311019Matrix Matcher72368
164411095Tabriz City72368
1645816Abbott's Revenge71373
164610206Stars71373
164710521Continuously Growing Fractions71373
164810395Titans in Danger70378
164910470Shifted Coefficient Number System70378
165010767Barcelona's trams70378
165110786Qualify for the Champions League70378
165210951Polynomial GCD70378
165310984Double NP-hard70378
1654767Game69384
165510729Treequivalence69384
165610798Be wary of Roses69384
165711084Anagram Division69384
165811117Little Quilt69384
1659286Dead Or Not -- That Is The Question68389
1660506System Dependencies68389
1661983Localized Summing for Blurring68389
166210876Factory Robot68389
166310981String Morphing68389
166411160Going Together68389
1665210Concurrency Simulator67395
1666283Compress67395
1667731Numerical Summation of a Series67395
166810760Translation or rotation67395
166911014Make a Crystal67395
167011245Anti-Arithmetic-Sequence67395
167111264Coin Collector67395
1672206Meals on Wheels Routing System66401
167310580Ransom Note66401
167411010Tic-Tac-Tough66401
167511116Babel Towers66401
1676234Switching Channels65407
1677578Polygon Puzzler65407
1678881Points, Polygons and Containers65407
167910095Saving the Planet65407
168011091How many Knight Placing?65407
1681238Jill's Bike64414
1682742Domino Game64414
168310204Adventures in Moving - Part V64414
168410447Sum-up the Primes (II)64414
168510613Mushroom Misery64414
168610711Stitching64414
168710837A Research Problem64414
168810904Structural Equivalence64414
1689818Cutting Chains63420
169010472Fastest Vs Cheapest63420
169110682Forró Party63420
169211224Let's swim!63420
169311249Game63420
169410272DDR King62427
169510358Matrix62427
169610501Simplified Shisen-Sho62427
169710565Matrix62427
169810632Pyramid62427
169911073Euler's Totient Function62427
1700826Symbolic Numerical System61434
170110073Constrained Exchange Sort61434
170210403Escape from Tut's Tomb61434
170310455Gray Code61434
170410899Billiard again61434
170511061Playing War61434
1706365Welfare Reform60441
1707370Bingo60441
1708631Microzoft Calendar60441
1709643Bulk Mailing60441
1710859Chinese Checkers60441
171110458Cricket Ranking60441
171210467Parse Tree60441
171310513Bangladesh Sequences60441
171410612Paper Folding60441
171510674Tangents60441
171610859Placing Lampposts60441
171710886Standard Deviation60441
171810907Art Gallery60441
171911030Predator II60441
172011097Poor My Problem! :-(60441
172111238Innoumerous bowling games60441
172210109Solving Systems of Linear Equations59449
172310322The Four in One Stadium59449
172410712Count the Numbers59449
172510853Pablito nailed a nail59449
172611118Prisoners, Boxes and Pieces of Paper59449
172711113Continuous Fractions58457
172811168Airport58457
172911198Dancing Digits58457
1730667Fence57465
173110588Queuing at the doctors57465
173210809Great Circle57465
173310941Words adjustment57465
173411124Troubles for Modern Days Problemsetters57465
173511153Museums57465
1736868Numerical Maze56473
17378742D Representations56473
1738883Overlapping Rectangles56473
173910631Normals56473
174010996Go56473
174111206Coloring the map, but not anyhow56473
174211229Improved tic-tac-toe.56473
174310638The Trip II55482
174410834The Story of Two Coins55482
174510836The Maximum Term55482
174611260Odd Root Sum55482
174711269Setting Problems55482
174810052Inviting Politicians54490
174910641Barisal Stadium54490
175010727Practice54490
175110867Cutting a Polygon54490
175210869Brownie Points II54490
175310960The Party, Part II54490
175410965Khepel's Problem54490
175511243Texas Trip54490
1756342HTML Syntax Checking53500
175710411Another Game of Tetris53500
175810481The Gift Wrappers of Hollywood53500
175911018Mars Buggy53500
176011178Morley's Theorem53500
176111256Repetitive Multiple53500
1762564Gaston52509
1763831Document Validator52509
176411071Permutation Representation52509
176511123Counting Trapizoid52509
1766957Popes51519
176710885Martin the Gardener51519
176810961Chasing After Don Giovanni51519
176911261Bishops51519
1770733Follow the Folding Dot50530
1771908Re-connecting Computer Sites50530
1772986How Many?50530
177310438Meta Editor50530
177411120Very Funny Mr. Feynman50530
177510335Ray Inside a Polygon49541
177610847Basic Tautologies49541
177711016Square Counting49541
177811259Coin Changing Again49541
1779918ASCII Mandelbrot48552
1780972Horizon Line48552
178110224Return of the Jedi48552
178210498Happiness48552
178311109Rinse48552
178411262Weird Fence48552
178510766Organising the Organisation47564
178610939Ants, Aphids and a Ladybug47564
178711165Galactic Travel47564
1788827Buddy Memory Allocator46576
1789853DVD Subtitles46576
1790873Loan (II)46576
1791960Gaussian Primes46576
179210864The Predator46576
179311190Series of Powers46576
1794473Raucous Rockers45589
1795678Schedule of Taiwan Baseball League45589
1796898Hole Cutter45589
179710266Surveying45589
179810289A Square and Equilateral Triangles45589
179910797Peaceful Sharing45589
1800367Halting Factor Replacement Systems44602
1801611Parallel Deadlock44602
1802802Lead or Gold44602
180310064Travelling in another Dimension44602
180410531Maze Statistics44602
180511107Life Forms44602
180611128Faulty Computer44602
180711144S.O.S.44602
1808581Word Search Wonder43616
1809842Crossword Puzzles43616
1810944Happy Numbers43616
181110828Back to Kernighan-Ritchie43616
181210884Persephone43616
181311006Wheel Good43616
181411176Winning Streak43616
1815214Code Generation42631
1816879Circuit Nets42631
1817985Round and Round Maze42631
181810121Legendary Pokemon42631
181910241Semi-triangular and also Square42631
182010402Triangle Covering42631
182110584Text Formalization42631
182211066Aragorn42631
1823282Rename41646
1824764Pentominos41646
1825841Snake41646
182610478The Falling Pillars41646
182710695Find the Point41646
182810752Distant Jumping41646
182911017A Greener World41646
183011175From D to E and Back41646
183111253Fractal41646
183210429Mohr's Circle40662
183310749Automobile Travelling40662
183411126Relaxed Golf40662
183511167Monkeys in the Emei Mountain40662
1836265Dining Diplomats39679
1837546Image Recognizer39679
1838976Bridge Building39679
183910796Right Hand Rule39679
184011156Continuous Drawing39679
1841237Monitoring Wheelchair Patients38697
1842683Character Decoding38697
1843744Triangular Museum38697
1844822Queue and A38697
1845946A Pile of Boxes38697
1846947Master Mind Helper38697
184711033Help my Brother38697
1848269Counting Patterns37716
1849569Horse Shoe Scoring37716
1850747Grid Soccer37716
1851804Petri Net Simulation37716
1852877Offset Polygons37716
1853990Diving for Gold37716
1854997Show the Sequence37716
185510676Grid Points37716
185610893Creating Sudoku Puzzles37716
185710967The Great Escape37716
185811065A Gentlemen's Agreement37716
185911187Water Crisis37716
1860243Theseus and the Minotaur (II)36736
1861284Logic36736
1862655Scrabble36736
1863878Rotating Tetris Pieces36736
1864995Super Divisible Numbers36736
186510031Saskatchewan36736
186611255Necklace36736
1867262Transferable Voting35757
186810671Grid Speed35757
186910758Journey35757
187010808Rational Resistors35757
187110833Lunar Forest35757
187210949Kids in a Grid35757
187311183Teen Girl Squad35757
1874809Bullet Hole34779
1875819Gifts Large and Small34779
187610103Karpovich blocks34779
187710108The Mosquito Killer Mosquitos34779
187810119Farewell, my friend34779
187910975Dueue's Quiz34779
188011025Mr. And Mrs. Hamilton34779
188111210Chinese Mahjong34779
1882285Crosswords33803
1883289A Very Nasty Text Formatter33803
1884925No more prerequisites, please!33803
188510135Herding Frosh33803
188610414Denki Blocks33803
188711212Editing a Book33803
1888475Wild Thing32828
1889549Evaluating an Equations Board32828
1890728Scatter Point Plot32828
1891906Rational Neighbor32828
189210538Powerful Magic Squares32828
189311250Working with Small Numbers32828
1894266Stamping Out Stamps31854
1895769Magic of David Copperfield31854
1896823Stopper Stumper31854
189710770Sokoban31854
189811007Mini Cube31854
189911266Equations31854
1900329PostScript Emulation30883
1901904Overlapping Air Traffic Control Zones30883
190210675Revenge of Faucet Flow30883
190311114Polygon Encoder30883
1904359Sex Assignments And Breeding Experiments29913
1905915Stack of Cylinders29913
1906978Lemmings Battle!29913
190710605Mines For Diamonds29913
190810737The Difference Engine29913
190911102Moonshine29913
191011214Guarding the Chessboard29913
191111252Take Me Home (To the Place I Belong)29913
191211268Reliable Network29913
1913225Golygons28946
1914293Bits28946
1915650Bowl28946
1916890Maze (II)28946
191710628Quadrills28946
191810691Subway28946
191910972RevolC FaeLoN28946
192011037Point of View in Flatland28946
1921251Nondeterministic Trellis Automata27981
1922396Top Dog27981
192310572Black & White27981
192410863Shovelling Snow27981
192511050Construct the wall maze27981
1926205Getting There261019
1927244Train Time261019
1928504Random number261019
1929891Syntrax261019
193010153New Horizons261019
193110829L-Gap Substrings261019
193211171SMS261019
193311177Fighting Against a Polygonal Monster261019
193411267The Hire-a-Coder Business Model261019
1935295Fatman251059
1936979The Abominable Triangleman251059
193711046Numbers and operations251059
1938687Lattice Practices241104
193910485Painting with CSE241104
194011169Deal or No Deal241104
194111179Bit Stream241104
194211196Birthday Cake241104
1943746Polygon Visibility231152
1944982Cube231152
194510435Compare Directories231152
194610969Sweet Dream231152
194711009Geometry Once Again231152
194811215How Many Numbers?231152
1949730Morse Code Generation221204
1950970Particles221204
195110756HardNumbers221204
195211209Be Together Again and Forever221204
195311257New Marketing Plan221204
1954777Codebreakers211261
1955813Robot211261
1956912Live From Mars211261
195710988From G to H and back211261
195811146Insurrection211261
1959212Use of Hospital Facilities201324
1960666Rating201324
196110151Spaghetti201324
196210155Green Eggs and Ham201324
196311075Collage201324
1964203Running Lights Visibility Calculator191394
1965801Flight Planning191394
1966905Tacos Panchita191394
1967953The Incredible Pile Machine191394
1968980X-Express191394
196911098Battle II191394
197011189A Simple Pendulum191394
197111194Stone Grid191394
1972322Ships181471
1973797Two Way Traffic181471
1974807Towers of Powers181471
1975854Worse Code181471
197610143Loan181471
197710314Three Pigs181471
197810753Exponential Function181471
197911135Gopher that walks and swims181471
198011251Fractions181471
1981204Robot Crash171558
1982249Bang the Drum Slowly171558
1983304Department171558
1984794Straightest Paths171558
1985798Tile Puzzle171558
1986829Almost Balanced Trees171558
1987862Origami171558
198811023Multisets and Sequences171558
198911119Chemical Attraction171558
199011193Infinix171558
1991207PGA Tour Prize Money161655
1992605The Rotating Disk161655
1993646The Gourmet Club161655
1994723Comment Removal161655
1995886Named Extension Dialing161655
1996887Revolutionary Calendar161655
1997889Islands161655
199810096The Richest Man of the Universe161655
199910762Treasure Castle161655
200010846Reading time from a clock161655
200110952Pattern Transformations161655
200211041Quarter-Finals with Brazil!? No!!!161655
200311079What's the Time?161655
200411142MineSweeper II161655
200511163Jaguar King161655
2006223Classifying Lots in a Subdivision151766
2007292Presentation Error151766
2008864Scheme Pretty-Printing151766
2009909The BitPack Data Compression Problem151766
2010921A Word Puzzle in the Sunny Mountains151766
2011922Rectangle by the Ocean151766
201210046Fold-up Patterns151766
201310636Stretching Geometry151766
201411141Sugar Cubes151766
2015233Package Pricing141892
2016720Hares and Foxes141892
201711139Counting Quadrilaterals141892
2018996Find the Sequence132037
201910629Truckin'132037
202011197Counting RNA sequences132037
202111265The Sultan's Problem132037
2022235Typesetting122207
2023281Rubik's Cube122207
2024690Pipeline Scheduling122207
2025691Triangle Partition122207
2026885Telephone Directory Alphabetization122207
2027888Donkey122207
2028949Getaway122207
2029952Uno game122207
2030954Tetravex solver122207
2031959Car Rallying122207
2032981Systematic Cyclic Redundancy Check Codes122207
2033987Maternity122207
203410639Square Puzzle122207
2035248Cutting Corners112408
2036749Machine Repair Simulation112408
2037849Radar Tracking112408
2038955Interpreting Old Maps112408
2039992Customer Service Cost Evaluation112408
204010492Optimal Mastermind Strategy112408
204110861Security by Ambiguity112408
2042217Radio Direction Finder102649
2043279Spin102649
2044525Milk Bottle Data102649
2045950Tweedle Numbers102649
2046956The Minimum Slot Machine102649
2047241Sail Race92943
2048354Crazy Calculator92943
2049786Working with Relations92943
2050923One Against Many92943
2051975Gutenberg Clumsy Helper92943
205210857Easter Eggs92943
2053463Polynomial Factorization83311
2054917Euro 200483311
2055919Cutting Polyominoes83311
2056958A Homer's Holiday83311
2057984Finding Haplotypes83311
205810383Queen vs Rook83311
205910955Playfair Cipher83311
2060894Juggling Trams73784
2061964Custom Language73784
2062973The Guessing Game73784
206310778Mathemagicland73784
206410840Multi-stage Compressor64414
206511145AvreniM64414
206611154An Octal World64414
206711199Equations in Disguise64414
2068219Department of Redundancy Department55297
2069951The Pieces of the Puzzle55297
207010630Millennium Ceremony55297
207111143Subtitles55297
2072693Digital Racing Circuit46621
2073977Old West Rumours46621
207410657Prince Frog II46621
207510974The Ridiculous Game46621
207611211Digital Logic46621
207710971Building Construction38828
207811213Flipull38828
207911248Frequency Hopping38828
2080961Ambiguous or Incomplete Inductive Definitions213243
208110059The Hazard of CSE Department!213243
208210757Interpreting SQL213243
2083109663KP-BASH Project213243
2084236VTAS - Vessel Traffic Advisory Service126485
2085863Process Scheduling126485
2086896Board Game126485
208710781Global Positioning System126485
208810845The crusades126485
208911263Nested Rectangles126485
2090224Kissin' Cousins0Impossible
2091228Resource Allocation0Impossible
2092252Trucking0Impossible
2093287Text Comparsion0Impossible
2094351``Cheapest'' Scores0Impossible
2095360Don't Get Hives From This One!0Impossible
2096363Approximate Matches0Impossible
2097364Constitutional Computing0Impossible
2098368Indexing Web Pages0Impossible
2099372WhatFix Notation0Impossible
2100456Robotic Stacker0Impossible
2101461The Reservation Maker0Impossible
2102470Nasty Virus0Impossible
2103472Simultaneous Equations0Impossible
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2105480Tempus Fugit0Impossible
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