Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▴ Users
CCO '06 P1 - CN Tower CCO 5 25.4% 140
Mock CCO '17 Problem 1 - Fast Fuhrer Transform Mock CCO 10p 25.4% 60
CCO '03 P1 - BFed CCO 10 25.4% 61
CCO '19 P6 - Bad Codes CCO 20p 25.6% 69
Mock CCO '17 Problem 2 - Penetrating Power Mock CCO 17p 25.7% 171
CCO '98 P1 - Fibonacci Numbers CCO 7 26.2% 158
CCO Preparation Test 5 P1 - City Game Mock CCO 15 26.4% 202
CCO '19 P5 - Marshmallow Molecules CCO 15p 26.5% 128
CCO '99 P1 - You Can't Get There From Here CCO 7 26.5% 16
CCO '96 P1 - Train Swapping CCO 5 26.9% 212
Mock CCO '19 Contest 1 Problem 6 - A Geometry Problem Mock CCO 15p 27.2% 16
CCO '22 P1 - Alternating Heights CCO 12p 27.6% 138
CCO '11 P1 - Putnam CCO 7 27.6% 108
Mock CCO '18 Contest 2 Problem 2 - Victor Rains Mock CCO 20p 27.7% 21
Mock CCO '18 Contest 4 Problem 4 - Time Travel Mock CCO 15p 27.8% 56
CCO '99 P3 - Manelzuma's Revenge CCO 10 28.6% 2
Mock CCO '18 Contest 3 Problem 2 - Roger Delegates Work to Jessica Mock CCO 20p 28.9% 23
CCO '20 P2 - Exercise Deadlines CCO 15p 29.7% 290
CCO '10 P2 - Tree Pruning CCO 15 29.9% 188
CCO '07 P6 - Road Construction CCO 20p 30.3% 180
CCO '08 P1 - Moving Day CCO 7p 30.5% 106
CCO '02 P5 - Connect The Campus CCO 12 31.0% 101
CCO '19 P1 - Human Error CCO 10p 31.0% 87
Mock CCO '19 Contest 2 Problem 1 - A Dynamic Connectivity Problem Mock CCO 15p 31.3% 70
CCO '08 P3 - Mobile CCO 17p 31.3% 46
CCO '08 P4 - Herding CCO 10p 31.5% 221
CCO '10 P5 - Space Miner CCO 15 31.5% 52
CCO '04 P6 - Orko CCO 15 31.6% 42
CCOQR '16 - Stupendous Bowties CCC 10p 31.8% 247
CCO '04 P5 - Jengaism CCO 7 31.8% 116
CCO '07 P1 - Cows CCO 10 32.3% 181
CCO Preparation Test 6 P2 - An Easy Problem Mock CCO 12p 32.5% 204
CCO '17 P5 - Professional Network CCO 20p 32.5% 166
Mock CCO '18 Contest 2 Problem 5 - Victor's Triangles Mock CCO 20p 33.2% 49
CCO '97 P3 - Porous Stone CCO 10 33.3% 2
CCO '12 P4 - Editor Distance CCO 10 33.6% 143
CCO '01 P3 - Partitions CCO 12 33.9% 63
CCO '10 P1 - Barking Dogs! CCO 10 33.9% 232
CCO '14 P4 - Where's That Fuel? CCO 7p 34.3% 386
CCO '99 P6 - Fast Food CCO 15 34.4% 10
Mock CCO '18 Contest 4 Problem 6 - Splitting Drones Mock CCO 15p 34.6% 37
CCO Preparation Test 1 P3 - K-th Rank Student Mock CCO 17p 34.9% 153
CCO '00 P1 - Subsets CCO 10 35.0% 269
CCO '11 P4 - Reorganization CCO 7p 35.1% 215
CCO '10 P6 - Shuffle CCO 10 35.4% 150
CCO '03 P2 - Concentration Cards CCO 15 36.1% 31
CCO '96 P2 - SafeBreaker CCO 10 36.2% 89
CCO '17 P4 - Rainfall Storage CCO 20p 36.2% 177
CCO '14 P2 - King Gruff CCO 15p 36.2% 253
CCO '16 P4 - O Canada CCO 10p 36.4% 263