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Try your hand at one of the practice problems, and submit your solution in the language of your choice (our judge accepts solutions in over 35+ languages). Receive points, and move up through the CodeChef ranks. Get better, and better prepare yourself for the competitions

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Name Code Successful Submissions Accuracy
   Ordering the Soldiers ORDERS 140 6.16
   Team Selection TEAMSEL 82 3.83
   Some More Homework MARCHA6 30 27.07
   Primes in the GCD table D4 26 9.13
   XOR Rounds RESN02 25 17.65
   The Guessing Game MARCHA3 21 15.33
   Swapping mismatches C1 20 4.75
   Divide and conquer F6 17 33.33
   Travelling Salesman Again ! TSPAGAIN 14 66.67
   Highways HIGH 13 15.96
   Johny the farmer E3 12 12.88
   Baking Cupcakes MUFFINS 12 12.37
   Bytelandian Shoppers BYTESHOP 12 33.33
   Congruent triangles H3 11 19.77
   Permutation Jumping RESN03 11 52.00
   Tidying Posters POSTERS 11 48.57
   Se7en F4 10 2.79
   Traffic jam N5 10 7.09
   Haunted Maze HAUNTED 10 22.22
   Authentication Failed AUTHEN 10 20.59
   Reaching the Rig REACHRIG 9 4.96
   Buggy algorithm E5 8 57.14
   Milestones MSTONES 7 23.26
   Adding Least Common Multiples LCM 6 8.97
   Backup Functions FUNCTION 6 25.00
   Product of Digits DIGITS 6 8.26
   The Hungry Bear HBEAR 6 24.14
   Ski Resort SKIRES 6 23.53
   Pruning Trees PRUNING 6 58.62
   Sines Sum Queries SINSUMQ 6 10.23
   Motorbike Racing M2 5 25.00
   Lights Out DORADM01 5 37.93
   Reduce string STREDUC 5 6.96
   Sine Partition Function PARSIN 5 40.00
   Card Shuffle CARDSHUF 5 12.24
   Bears and Bees BEARS 5 29.41
   Magic Strings J5 4 17.65
   Help the judge J6 4 36.67
   Graph Counting GRAPHCT 4 28.57
   Genetics GENETICS 4 20.35
   Rearranging Digits ARRANGE2 4 6.48
   Renting Spare Oven Time OVENTIME 4 19.44
   Product of Digits Again DIGITS2 4 38.46
   Coloring in Hypercube HPARITY 4 41.67
   D-Power Permutations DPOWPERM 4 12.90
   Alien language G4 3 7.50
   Chemical reactions G5 3 25.00
   Alternating Permutations SNCK03 3 27.27
   The Mine Field M1 3 50.00
   Wildcard Matching L2 3 11.43
   The Reversed World REVERSED 3 12.20
   Generalized Independent Sets GENIND 3 40.00
   Exponentiation Commutativity EXPCOMM 3 16.67
   Sum Divides Product PRDIVSUM 3 4.10
   Preferred Cooking Schools CKSCHOOL 3 19.23
   Something About Divisors DIVISORS 3 15.00
   Short SHORT 3 59.09
   Misinterpretation 2 MISINT2 3 18.75
   Ciel and Random Walk CIELWALK 3 10.71
   Can you do it better CYDB 3 5.56
   Find a Subsequence FINDSEQ 3 10.26
   The Bytelandian Union A8 2 3.51
   Toll Trolls M4 2 22.22
   Box Packers INSOMB4 2 22.22
   Falling Snow INSOMB8 2 42.86
   Effective Sets J4 2 6.06
   Powerful Strongholds SNCK02 2 28.57
   Place the balloon L5 2 16.67
   Heroes of Magical Might N2 2 66.67
   Generalized Spanning Trees GST 2 11.11
   Communicating Servers SERVERS 2 21.43
   Escape The Ruins ESCAPE 2 66.67
   Even Coefficients EVENPOLY 2 100.00
   Buying Land BUYLAND 2 31.25
   Attack of the Clones CLONES 2 20.00
   Minesweeper Reversed MINESREV 2 5.56
   Billboards BB 2 50.00
   Yet Another Sequence YASEQ 2 40.00
   Hypertrees HYPER 2 40.00
   Lame Queen Game LAMQUGAM 2 21.43
   Packing the Boxes A5 1 2.78
   A Christmas Pizza Puzzle A7 1 17.86
   Alien Clock D7 1 10.00
   Get a Clue CLUE 1 50.00
   Stepping Numbers STEPNUMS 1 2.38
   Algebra Express ACMKANPE 1 16.67
   Rush Hour RUSHHOUR 1 16.67
   Chef attic window WINDOW 1 9.68
   Divisors number divisibility DIVNODIV 1 4.44
   Colored Domino Tilings and Cuts DOMNOCUT 1 20.00
   Counting Hexagons CNTHEX 1 20.00
   Short II SHORT2 1 14.29
   Lucky Days LUCKYDAY 1 2.94
   The Archipelago ARCHPLG 0 0.00
   Overlapping discs M5 0 0.00
   Lighting the shop LIGHTING 0 0.00
   Post Office POST 0 0.00
   Problem With Strings ACMKANPA 0 0.00
   Traffic Jam ACMKANPC 0 0.00
   Frosting Cupcakes MUFFINS2 0 0.00
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