Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▴ Users
OCC '19 B1 - Darcy_Liu Olympiads School 3 15.2% 159
An Animal Contest 7 P2 - Squirrel Structures AAC 7p 15.2% 138
CCO '01 P6 - Election Night CCO 15 15.2% 47
IOI '11 P2 - Race (Standard I/O) IOI 17p 15.2% 529
JOI '16 Open P2 - Selling RNA Strands JOI 20 15.2% 15
Thog's Fortnite 2 Uncategorized 17p 15.2% 8
COCI '16 Contest 3 #5 Zoltan COCI 15p 15.2% 22
NOI '04 P1 - The Depressed Cashier China NOI 20p 15.3% 87
RGPC '17 P1 - Circle Clicking! Uncategorized 5 15.3% 143
GlobeX Cup '18 S3 - Playing With Bits Uncategorized 10p 15.3% 46
CCO '19 P4 - Card Scoring CCO 25p 15.3% 68
Baltic OI '06 P6 - Jump Baltic OI 7p 15.3% 22
Amplitude Hackathon '23 Problem 4 - Frequency Queries Uncategorized 7p 15.3% 16
TSOC '16 Contest 2 #2 - Oh My! TSOC 10 15.3% 18
COCI '22 Contest 3 #4 Bomboni COCI 12p 15.3% 61
IOI '07 P1 - Aliens IOI 12p 15.3% 21
STNBD P4 - Ellis Fahrengart Uncategorized 17p 15.3% 136
IOI '12 P2 - Parachute Rings IOI 25p 15.3% 24
DMPG '16 B6 - Counting Money DMOPC 7p 15.3% 44
DMOPC '17 Contest 4 P6 - Best Girl DMOPC 25p 15.4% 10
CCC '23 S3 - Palindromic Poster CCC 10p 15.4% 420
CCO '15 P2 - Artskjid CCO 15p 15.4% 503
Appleby Contest '20 P4 - Philosophy Class Uncategorized 12p 15.4% 86
CCO '18 P2 - Wrong Answer CCO 12p 15.4% 115
GlobeX Cup '19 J2 - Winnie Waifu Wars Uncategorized 3p 15.4% 47
Sudoku Challenge Uncategorized 7p 15.4% 63
NOIP '18 P5 - Grid-filling Game China NOI 20p 15.4% 5
COI '18 #4 Tenis COCI 30p 15.4% 4
DMOPC '19 Contest 7 P7 - Fluid Dynamics DMOPC 35p 15.4% 15
Bubble Cup V9 C Paint it really, really black Bubble Cup 10 15.4% 21
DMOPC '17 Contest 2 P5 - Game DMOPC 20p 15.4% 9
DMOPC '21 Contest 2 P5 - Permutations DMOPC 25p 15.4% 15
Riolku's Mock CCC S2 - Keen Keener Sequence Mock CCC 7p 15.4% 147
MMCC '15 P2 - Akame Uncategorized 25p 15.4% 46
DMOPC '17 Contest 2 P6 - Lazy Days DMOPC 15p 15.4% 36
WC '02 P6 - Obstacles Galore Woburn Challenge 10 15.5% 13
CCO '96 P6 - Hoppers CCO 15 15.5% 29
DWITE '12 R5 #4 - Fencing Problems DWITE 5 15.5% 9
Wesley's Anger Contest Reject 1 - Stupendous Bowties 2 WAC 17 15.5% 25
Mock CCC '20 Contest 2 S3 - Tree Programming Mock CCC 10p 15.5% 79
Mock CCO '18 Contest 3 Problem 6 - Roger Asks For More Marks Mock CCO 30p 15.5% 8
BSSPC '22 P4 - Exec Pieing Uncategorized 5p 15.5% 221
DMOPC '22 Contest 2 P1 - DMOPC Crisis DMOPC 5p 15.5% 313
Collate The Findings Uncategorized 0 15.5% 34
IOI '17 P2 - Wiring IOI 25p 15.5% 56
IOI '15 P6 - Towns IOI 40p 15.5% 59
An Animal Contest 5 P2 - Permutations & Products AAC 5p 15.5% 283
Baltic OI '11 P8 - Tree Mirroring Baltic OI 35p 15.5% 8
CPC '21 Contest 1 P7 - AQT and Quarantine Uncategorized 20p 15.5% 15
DMOPC '21 Contest 7 P3 - Whack-an-Ishigami DMOPC 12p 15.5% 82