Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
WC '99 P4 - Goldfinger Woburn Challenge 5 33.7% 98
WC '02 P2 - Cow-bot Woburn Challenge 10 21.9% 62
WC '01 Suicidal P3 - Regis Woburn Challenge 7 16.0% 36
WC '02 Suicidal P4 - The Spell of Lord Ruru Woburn Challenge 10 29.3% 5
WC '01 Suicidal P1 - Survivor Woburn Challenge 10 11.2% 14
WC '97 P2 - Power of Cryptography Woburn Challenge 20 12.1% 12
WC '99 P1 - The Matrix Woburn Challenge 7 33.9% 44
WC '96 P1 - Fishes in a Tank Woburn Challenge 5 24.7% 39
WC '01 P6 - Mission Impossible 3 Woburn Challenge 5p 17.7% 87
WC '99 P7 - The Rock Woburn Challenge 15 23.5% 27
WC '02 P4 - It's Party Time Woburn Challenge 5 22.1% 80
WC '02 Suicidal P2 - Klingon Roulette Woburn Challenge 10 15.6% 6
WC '99 P2 - Mission Impossible Woburn Challenge 7 18.5% 56
WC '98 P4 - GATTACA Woburn Challenge 20p 11.6% 6
WC '01 P4 - Cool Runnings Woburn Challenge 10 24.2% 19
WC '02 P3 - The Big Book of Recipes Woburn Challenge 10 6.2% 5
WC '95 P2 - Round Numbers Woburn Challenge 12p 8.7% 38
WC '07 P4 - Drain Game Woburn Challenge 15p 11.9% 9
WC '02 Suicidal P1 - Dark Lord Woburn Challenge 12 12.7% 16
WC '99 P6 - Fight Club Woburn Challenge 10 23.8% 38
WC '17 Contest 4 S4 - Alpha Nerd (Hard) Woburn Challenge 25p 33.3% 1
WC '02 P6 - Obstacles Galore Woburn Challenge 10 15.5% 13
WC '99 P5 - Good Will Hunting Woburn Challenge 5 16.8% 86
WC '02 P8 - Deploying Troops Woburn Challenge 7 18.0% 44
WC '01 Suicidal P6 - Blind Date Woburn Challenge 20p 32.8% 10
WC '02 P1 - A Planning Session Woburn Challenge 5 16.7% 62
WC '02 P10 - The Final Battle Woburn Challenge 10 23.5% 19
WC '07 P3 - Strategy Meeting Woburn Challenge 10 20.2% 133
CCCHK '15 S1 - Finding number of pairs CCC 7p 13.7% 143
CCCHK '15 S2 - Matching Problem CCC 10p 4.9% 14
CCCHK '15 S3 - Symmetric Cross CCC 12p 16.2% 20
CCCHK '15 S4 - When to meet? CCC 15p 20.0% 8
CCCHK '15 S5 - Can I pass the courses? CCC 25p 5.0% 6
Fast LCA (Hard) Uncategorized 17 8.7% 7
Temple Construction Uncategorized 20p 14.5% 4
Sum Maximization Uncategorized 10p 22.8% 47
Casino Crisis Uncategorized 12p 33.8% 56
Baltic OI '17 P6 - Cat in a tree Baltic OI 15p 35.0% 107
Baltic OI '17 P4 - Friends Baltic OI 35p 25.0% 5
Baltic OI '17 P5 - Plus Minus Baltic OI 15p 38.5% 27
Baltic OI '17 P1 - Political Development Baltic OI 25p 23.2% 29
Baltic OI '17 P3 - Railway Baltic OI 17p 34.6% 76
Baltic OI '17 P2 - Toll Baltic OI 20p 47.6% 40
DMOJ Capture The Flag '20 R3 - Harder Assembly CTF 7 29.4% 14
DMOJ Capture The Flag '20 R4 - Python Cycles CTF 12 41.9% 13
DMOJ Capture The Flag '20 B2 - Strings CTF 7 16.5% 23
DMOJ Capture The Flag '20 B3 - Classic Buffer Overflow CTF 7 10.7% 25
Baltic OI '16 P1 - Bosses Baltic OI 10p 41.4% 37
Baltic OI '16 P2 - Park Baltic OI 20p 51.7% 11
Baltic OI '16 P3 - Spiral Baltic OI 30p 13.3% 4