Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
Mock CCO '17 Problem 5 - Blitzkrieg Mock CCO 17p 12.4% 13
CCO '03 P3 - Cube CCO 20p 12.4% 14
WC '15 Contest 4 S4 - Stakeout Woburn Challenge 20p 12.4% 15
An Animal Contest 1 P4 - Alpaca Arrays AAC 10p 12.4% 246
APIO '18 P2 - Circle Selection APIO 40p 12.4% 6
WC '18 Finals S5 - Opening Weekend Woburn Challenge 25p 12.4% 6
ICPC PACNW 2016 E - Enclosure ICPC 30 12.4% 9
COCI '06 Contest 5 #4 Liga COCI 12p 12.4% 44
IOI '16 P4 - Paint by Numbers IOI 15p 12.4% 54
WOSS Dual Olympiad 2023 S2: Geese Attack Uncategorized 10 12.4% 36
COCI '15 Contest 3 #2 Esej COCI 5 12.3% 38
CCO '99 P2 - Common Words CCO 10 12.3% 315
DMOPC '17 Contest 4 P2 - A Heavy Light Decomposition Problem DMOPC 7p 12.3% 119
IOI '14 P6 - Holiday (Standard I/O) IOI 30p 12.3% 135
NOIP '20 P3 - Game of Moving Ball China NOI 15p 12.3% 6
Halloween '14 P3 - Dog Girls Seasonal 15p 12.3% 76
An Animal Contest 5 P5 - Counting Rectangles AAC 15p 12.3% 50
Good Code Uncategorized 15 12.3% 24
Yet Another Contest 1 P5 - Hopping Kangaroos YAC 17p 12.3% 19
NOI '13 P2 - Tree Count China NOI 25p 12.3% 20
COCI '15 Contest 3 #6 Domino COCI 20p 12.3% 39
An Animal Contest 6 P5 - Rock Painting AAC 20p 12.3% 18
Mock CCO '18 Contest 3 Problem 3 - Roger Just Plays Some More Chess Mock CCO 20p 12.3% 33
TLE '17 Contest 1 P4 - Tempest TLE 12p 12.3% 52
TLE '17 Contest 5 P5 - Word Compression TLE 25p 12.2% 6
GlobeX Cup '19 S3 - Ninjaclasher's Wrath Uncategorized 12p 12.2% 19
NOI '11 P2 - Intelligent Car Racing China NOI 25p 12.2% 10
BPC 1 S4 - Binary Matrices Uncategorized 25p 12.2% 9
Art Academy IV: Alice's Blazing Fury Uncategorized 30p 12.2% 4
ECOO '16 R3 P1 - Nerd Poker ECOO 7p 12.2% 10
WC '15 Contest 3 J4 - LexCorp Infiltration Woburn Challenge 15p 12.2% 15
DMOPC '22 Contest 4 P5 - Blackboard Game DMOPC 17p 12.2% 36
ICPC ECNA 2000 E - Checker's Check ICPC 15 12.2% 4
ECOO '07 R3 P4 - Reverse Polish Logic ECOO 7p 12.2% 9
Google Code Jam '19 Qualification Round Problem C - Cryptopangrams Google Code Jam 10p 12.2% 4
Back To School '19: Parkour Seasonal 5p 12.2% 174
LKP '18 Contest 1 P3 - Polynomial Madness Uncategorized 7p 12.2% 51
SGS Programming Challenge P2 - Vending Machine in Lunch Uncategorized 10p 12.2% 54
CCO '02 P3 - Return To Blind Man's Bluff CCO 12 12.2% 16
GFSSOC '14 Winter S5 - Stardust Snow GFSSOC 20p 12.2% 70
MNYC '16: Jelly Seasonal 10p 12.2% 39
Baltic OI '09 P4 - Rectangle Baltic OI 10p 12.1% 18
EGOI '22 P2 - Lego Wall EGOI 15p 12.1% 18
Another Contest 1 Problem 1 - Binary String Operations ACC 25 12.1% 44
NOI '19 P1 - Route China NOI 25p 12.1% 51
DMPG '16 B5 - Bank Burning DMOPC 5p 12.1% 52
TLE '17 Contest 4 P5 - Pascal's Tree TLE 15p 12.1% 47
COI '14 #2 Kovanice COCI 15p 12.1% 19
IOI '01 P6 - Depot IOI 30p 12.1% 39
IOI '17 P5 - Simurgh IOI 40p 12.1% 16