Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
Mock CCO '18 Contest 3 Problem 6 - Roger Asks For More Marks Mock CCO 30p 15.5% 8
CCO '96 P6 - Hoppers CCO 15 15.5% 29
CCO '18 P2 - Wrong Answer CCO 12p 15.4% 115
CCO '15 P2 - Artskjid CCO 15p 15.4% 503
CCO '19 P4 - Card Scoring CCO 25p 15.3% 67
CCO '01 P6 - Election Night CCO 15 15.2% 47
CCO Preparation Test 3 P2 - Packing Up Mock CCO 25p 14.9% 117
Mock CCO '19 Contest 1 Problem 4 - A Chemistry Problem Mock CCO 15p 14.9% 13
CCO '07 P2 - Snowflakes CCO 10 14.4% 958
CCO '18 P4 - Gradient Descent CCO 15p 14.4% 247
Mock CCO '19 Contest 1 Problem 5 - A Tree Problem Mock CCO 25p 14.3% 6
CCO '16 P2 - Splitting Hares CCO 15p 14.2% 89
Mock CCO '18 Contest 4 Problem 1 - Mining for Minerals Mock CCO 15p 14.2% 40
CCO '04 P4 - Return of Space Turtle CCO 12 14.2% 46
CCO '23 P2 - Real Mountains CCO 17p 14.2% 63
CCO '09 P4 - Bottle Caps CCO 20p 14.2% 37
CCO '05 P6 - Windows CCO 30p 14.2% 28
CCO '17 P3 - Vera and Modern Art CCO 30p 14.1% 93
Mock CCO '18 Contest 2 Problem 3 - Victor Trains Mock CCO 20p 14.0% 7
CCO Preparation Test 3 P1 - Primitive Pythagorean Pairs Mock CCO 25p 13.7% 20
CCO Preparation Test 7 P2 - XOR Path Mock CCO 20p 13.5% 16
CCO Preparation Test 2 P1 - Concatenation Mock CCO 17p 13.1% 32
CCO '03 P6 - Cheap Gas CCO 20p 13.1% 79
CCO '09 P1 - Invasion of the Boxes CCO 20p 12.8% 22
CCO '22 P5 - Phone Plans CCO 20p 12.7% 31
CCO '15 P3 - Solar Flight CCO 20p 12.7% 67
CCO '05 P4 - Primed Sequences CCO 12p 12.6% 92
CCO '11 P6 - Biggest (Zero Carbon) Footprint CCO 15p 12.6% 78
Mock CCO '17 Problem 3 - Connection Mock CCO 20p 12.5% 38
CCO '98 P3 - Bus Schedule CCO 12 12.5% 2
Mock CCO '17 Problem 5 - Blitzkrieg Mock CCO 17p 12.4% 13
CCO '03 P3 - Cube CCO 20p 12.4% 14
CCO '99 P2 - Common Words CCO 10 12.3% 313
Mock CCO '18 Contest 3 Problem 3 - Roger Just Plays Some More Chess Mock CCO 20p 12.3% 33
CCO '02 P3 - Return To Blind Man's Bluff CCO 12 12.2% 16
CCO '21 P2 - Weird Numeral System CCO 17p 12.2% 85
CCO Preparation Test 1 P1 - Double Cross Mock CCO 20p 12.1% 10
CCO Preparation Test 1 P2 - Escape Maze Mock CCO 20p 12.0% 39
CCO '97 P4 - High Tide CCO 10 11.8% 3
CCO '02 P4 - Duathlon CCO 10 11.3% 38
Mock CCO '18 Contest 3 Problem 5 - Roger Outsources DMOJ Work Mock CCO 15p 11.2% 8
CCO '97 P1 - Palindromes CCO 10 11.1% 21
CCO '06 P6 - Paint by Numbers CCO 30 11.0% 9
Mock CCO '19 Contest 2 Problem 2 - A Simulation Problem Mock CCO 15p 10.7% 8
CCO '23 P3 - Line Town CCO 30p 10.7% 21
CCO '07 P3 - Bowling for Numbers++ CCO 20p 10.5% 80
CCO '01 P5 - Fast Food CCO 7 10.1% 29
Mock CCO '19 Contest 2 Problem 4 - A Geometry Problem Mock CCO 5p 9.9% 6
CCO '16 P3 - Legends CCO 30p 9.8% 61
CCO '09 P2 - Dinner CCO 20p 9.8% 50