Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users
Waterloo 2017 Fall C - Computer Science Waterloo Local 10p 30.3% 35
Waterloo 2017 Fall D - Drama Waterloo Local 20p 37.5% 6
Waterloo 2017 Fall E - English Waterloo Local 15p 41.7% 5
Waterloo 2017 Winter A - Vera and Outfits Waterloo Local 3 70.8% 605
Waterloo 2017 Winter B - Vera and LCS Waterloo Local 10 18.2% 215
Waterloo 2017 Winter C - Vera and Mean Sorting Waterloo Local 10 34.0% 26
Waterloo 2017 Winter D - Vera and Sorting Waterloo Local 15 47.2% 31
Waterloo 2017 Winter E - Vera and Love Triangles Waterloo Local 25 33.9% 12
Waterloo 2022 Fall A - Zero AAMP Currents Waterloo Local 10 56.0% 43
Waterloo 2022 Fall B - Lightbulbs Waterloo Local 15 20.8% 19
Waterloo 2022 Fall C - Squaring the Triangle Waterloo Local 17 33.6% 30
Waterloo 2022 Fall D - Course Selection Waterloo Local 5 64.1% 60
Waterloo 2022 Fall E - Water Flow Waterloo Local 12 20.3% 9
Waterloo 2023 Fall A - Black Frame Waterloo Local 12 27.1% 16
Waterloo 2023 Fall B - Orb Tent Waterloo Local 17 31.6% 13
Waterloo 2023 Fall C - Whitewater Rafting Waterloo Local 17 19.1% 20
Waterloo 2023 Fall D - Reptilian Communism Waterloo Local 7 25.8% 29
Waterloo 2023 Fall E - Loose Goose Waterloo Local 25 5.3% 2
Waterloo 2023 Winter A - So I'll Max Out My Constructive Algorithm Skills Waterloo Local 5 32.0% 32
Waterloo 2023 Winter B - Laser Trap Waterloo Local 12 20.8% 18
Waterloo 2023 Winter C - Sandpile on Clique Waterloo Local 10 25.7% 20
Waterloo 2023 Winter D - Link-Cut Tree Waterloo Local 10 53.5% 21
Waterloo 2023 Winter E - Colourful Tree Waterloo Local 25 7.9% 8
Waterloo 2025 Fall A - Planting Trees Waterloo Local 30 17.4% 16
Waterloo 2025 Fall B - Palindromic Triplets Waterloo Local 20 30.4% 19
Waterloo 2025 Fall C - Magic Matrix Waterloo Local 12 54.3% 17
Waterloo 2025 Fall D - The Worm in the Apple Waterloo Local 20 17.0% 8
Waterloo 2025 Fall E - Efficient Room Scheduling Waterloo Local 5 59.7% 41
WC '01 P1 - The Rock Woburn Challenge 7 69.9% 30
WC '01 P2 - The Island Of Dr. Strangelove Woburn Challenge 10 38.5% 8
WC '01 P3 - Back to the Future Woburn Challenge 5 63.7% 231
WC '01 P4 - Cool Runnings Woburn Challenge 10 24.2% 19
WC '01 P5 - The Man With The Golden Eye Woburn Challenge 12 15.2% 18
WC '01 P6 - Mission Impossible 3 Woburn Challenge 5p 18.2% 93
WC '01 P7 - The Sixth Sense Woburn Challenge 15 7.1% 4
WC '01 P8 - Time to Get Medieval Woburn Challenge 10 38.8% 42
WC '01 P9 - The Thirteenth Floor Woburn Challenge 15 32.0% 6
WC '01 Suicidal P1 - Survivor Woburn Challenge 10 9.0% 15
WC '01 Suicidal P2 - Temptation Island Woburn Challenge 10 34.2% 31
WC '01 Suicidal P3 - Regis Woburn Challenge 7 14.7% 40
WC '01 Suicidal P4 - Big Brother Woburn Challenge 15 6.6% 4
WC '01 Suicidal P5 - The Mole Woburn Challenge 15p 15.1% 10
WC '01 Suicidal P6 - Blind Date Woburn Challenge 20p 31.3% 9
WC '02 P1 - A Planning Session Woburn Challenge 5 17.8% 69
WC '02 P10 - The Final Battle Woburn Challenge 10 26.5% 26
WC '02 P2 - Cow-bot Woburn Challenge 10 21.3% 68
WC '02 P3 - The Big Book of Recipes Woburn Challenge 10 9.2% 13
WC '02 P4 - It's Party Time Woburn Challenge 5 23.0% 86
WC '02 P5 - Intercepted Cowmmunication Woburn Challenge 5 35.9% 70
WC '02 P6 - Obstacles Galore Woburn Challenge 10 16.1% 15