Problems

Problem Category Points AC % Users ▾
Mock CCO '18 Contest 3 Problem 3 - Roger Just Plays Some More Chess Mock CCO 20p 12.3% 33
CCO Preparation Test 2 P1 - Concatenation Mock CCO 17p 13.1% 32
CCO '03 P2 - Concentration Cards CCO 15 36.1% 31
CCO '22 P5 - Phone Plans CCO 20p 12.1% 30
CCO '96 P6 - Hoppers CCO 15 15.5% 29
CCO '01 P5 - Fast Food CCO 7 10.1% 29
Mock CCO '19 Contest 2 Problem 6 - A Fundraising Problem Mock CCO 12p 15.8% 28
CCO '22 P4 - Bi-ing Lottery Treekets CCO 20p 22.4% 28
CCO '05 P6 - Windows CCO 30p 14.0% 27
CCO '22 P3 - Double Attendance CCO 25p 7.4% 27
Mock CCO '17 Problem 6 - Dire Consequences Mock CCO 20 24.2% 25
CCO '20 P3 - Mountains and Valleys CCO 35p 5.8% 25
The Contest Contest 1 P5 - A Typical CCO Problem Uncategorized 20p 4.2% 24
Mock CCO '18 Contest 3 Problem 2 - Roger Delegates Work to Jessica Mock CCO 20p 28.9% 23
Mock CCO '18 Contest 2 Problem 4 - Victor's Rectangles Mock CCO 20p 21.9% 22
CCO '09 P1 - Invasion of the Boxes CCO 20p 12.8% 22
CCO '02 P1 - Spam CCO 12 49.1% 22
Mock CCO '18 Contest 2 Problem 2 - Victor Rains Mock CCO 20p 27.7% 21
CCO '97 P1 - Palindromes CCO 10 11.1% 21
CCO '23 P3 - Line Town CCO 30p 10.7% 21
CCO Preparation Test 3 P1 - Primitive Pythagorean Pairs Mock CCO 25p 13.7% 20
CCO '98 P2 - Message Deciphering CCO 7 51.9% 20
CCO '99 P4 - Maple Roundup CCO 10 21.8% 19
CCO '98 P5 - Text Segmentation CCO 10 22.8% 17
CCO '23 P6 - Triangle Collection CCO 25p 16.2% 17
CCO Preparation Test 7 P2 - XOR Path Mock CCO 20p 13.5% 16
CCO '99 P1 - You Can't Get There From Here CCO 7 27.5% 16
Mock CCO '19 Contest 1 Problem 6 - A Geometry Problem Mock CCO 15p 27.2% 16
CCO '02 P3 - Return To Blind Man's Bluff CCO 12 12.2% 16
CCO '03 P3 - Cube CCO 20p 12.4% 14
CCO '23 P5 - Travelling Trader CCO 30p 7.0% 14
CCO '14 P6 - Gates CCO 40p 9.0% 13
CCO Preparation Test 5 P2 - Corporative Network Mock CCO 15 7.0% 13
Mock CCO '17 Problem 5 - Blitzkrieg Mock CCO 17p 12.4% 13
Mock CCO '19 Contest 1 Problem 4 - A Chemistry Problem Mock CCO 15p 14.9% 13
CCO '21 P6 - Loop Town CCO 50p 4.7% 13
Mock CCO '18 Contest 3 Problem 1 - Roger Meets For DMPG Mock CCO 15p 9.6% 12
CCO '22 P6 - Good Game CCO 35p 19.6% 12
CCO '97 P6 - Aligning DNA CCO 7 20.6% 11
CCO '00 P3 - The Game Of 31 CCO 15 54.5% 11
CCO '01 P2 - Coke or Chocolate Milk CCO 12 17.1% 11
CCO '06 P4 - CN Tower 2 CCO 30 5.4% 11
CCO '07 P5 - Particle Catcher CCO 30p 16.3% 10
CCO Preparation Test 1 P1 - Double Cross Mock CCO 20p 12.1% 10
CCO '99 P6 - Fast Food CCO 15 34.4% 10
CCO Preparation Test 5 P3 - Minimum Cycle Mock CCO 15p 9.4% 9
Mock CCO '18 Contest 1 Problem 5 - A Counting Problem Mock CCO 20p 24.5% 9
Mock CCO '18 Contest 2 Problem 6 - Victor's Cubes Mock CCO 20p 18.3% 9
CCO '02 P6 - Pit Stop Strategy CCO 12 52.7% 9
CCO '06 P6 - Paint by Numbers CCO 30 11.0% 9