Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points ▾ AC % Users
Mock CCC '23 2 S2 - Keenan Hates Triangles Mock CCC 7p 2.3% 38
CCC '23 S2 - Symmetric Mountains CCC 7p 26.5% 815
OTHS Coding Competition 1 (Mock CCC) J4 - Railgun Uncategorized 7p 23.4% 169
Mock CCC '24 Contest 1 S2 - Owen the Toucan Mock CCC 7p 33.1% 188
CCC '24 J5 - Harvest Waterloo CCC 7p 37.7% 349
CCC '96 S1 - Deficient, Perfect, and Abundant CCC 5 32.3% 1894
CCC '13 S1 - From 1987 to 2013 CCC 5 45.8% 3925
CCC '14 S1 - Party Invitation CCC 5 47.1% 3527
CCC '14 S2 - Assigning Partners CCC 5 33.3% 2845
CCC '13 J4 - Time on task CCC 5 44.5% 3017
CCC '98 S1 - Censor CCC 5 37.5% 1476
CCC '05 J3 - Returning Home CCC 5 37.2% 2364
CCC '11 J2 - Who Has Seen The Wind CCC 5 25.7% 1867
CCC '11 J3 - Sumac Sequences CCC 5 43.3% 2875
CCC '06 S1 - Maternity CCC 5 37.5% 1147
CCC '06 S2 - Attack of the CipherTexts CCC 5 5.2% 239
CCC '11 S1 - English or French? CCC 5 35.6% 5779
CCC '04 J4 - Simple Encryption CCC 5 51.0% 1711
CCC '08 S1 - It's Cold Here! CCC 5 37.5% 2181
CCC '08 S2 - Pennies in the Ring CCC 5 30.5% 1184
CCC '05 S1 - Snow Calls CCC 5 43.3% 2278
CCC '05 S2 - Mouse Move CCC 5 37.3% 1685
CCC '10 J2 - Up and Down CCC 5 21.8% 2052
CCC '10 J3 - Punchy CCC 5 33.0% 1398
CCC '10 J4 - Global Warming CCC 5p 22.5% 1057
CCC '09 J2 - Old Fishin' Hole CCC 5 39.1% 1590
CCC '09 J3 - Good Times CCC 5 20.3% 1384
CCC '09 S1 - Cool Numbers CCC 5 22.8% 2027
CCC '13 S2 - Bridge Transport CCC 5 26.7% 2058
CCC '12 S2 - Aromatic Numbers CCC 5 53.4% 1717
CCC '10 S1 - Computer Purchase CCC 5 14.1% 1326
CCC '10 S2 - Huffman Encoding CCC 5 53.6% 1576
CCC '03 S1 - Snakes and Ladders CCC 5 20.5% 3107
CCC '03 S2 - Poetry CCC 5 17.3% 1456
CCC '02 S1 - The Students' Council Breakfast CCC 5 39.6% 1498
CCC '02 S2 - Fraction Action CCC 5 19.0% 1885
CCC '07 S2 - Boxes CCC 5 27.5% 1214
Mock CCC '15 S1 - Dupvoting Mock CCC 5p 18.3% 151
Mock CCC '15 S2 - Problem-setting Pandemonium Mock CCC 5p 34.7% 258
Mock CCC '15 J2 - Lowest Exam Mark Mock CCC 5p 11.5% 419
CCC '15 S2 - Jerseys CCC 5p 26.7% 1959
CCC '15 J3 - Rövarspråket CCC 5p 38.5% 2269
CCC '15 J4 - Wait Time CCC 5 39.4% 1314
CCC '16 S2 - Tandem Bicycle CCC 5p 53.3% 3505
CCC '16 J3 - Hidden Palindrome CCC 5 45.9% 2562
CCC '16 J4 - Arrival Time CCC 5 29.1% 1682
CCCHK '15 J2 - What is the minimum area? CCC 5 35.7% 267
CCCHK '15 J3 - Queens can't attack me! CCC 5 51.1% 613
CCCHK '15 J4 - Where to build my house? CCC 5 18.0% 270
CCC '96 S3 - Pattern Generator CCC 5 11.0% 355