Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
CCC '09 J3 - Good Times CCC 5 20.3% 1383
OTHS Coding Competition 1 (Mock CCC) J5 - Scavenger Hunt Uncategorized 10p 20.3% 70
COI '15 #2 Palinilap COCI 25p 20.3% 13
DMOPC '14 Contest 1 P1 - Median Mark DMOPC 5p 20.3% 660
NOI '02 P1 - Legend of the Galactic Heroes China NOI 15p 20.3% 74
GlobeX Cup '18 J4 - Magical Functions Uncategorized 7p 20.3% 165
DMOPC '14 Exam Time P4 - Exam Delay DMOPC 10p 20.3% 221
DMOPC '15 Contest 5 P4 - Steins;Number DMOPC 12p 20.3% 70
NOI '99 P4 - Chessboard Division China NOI 15p 20.3% 14
NOI '16 P4 - Interval China NOI 20p 20.3% 23
MEC '16 P2 - Conveyor Belt Seasonal 5p 20.3% 52
NOI '99 P2 - Nails and Ball China NOI 15p 20.3% 15
Another Random Contest 1 P6 - Smash Bros Uncategorized 15p 20.3% 15
An Animal Contest 3 P3 - Monkey Market AAC 7 20.2% 400
WC '07 P3 - Strategy Meeting Woburn Challenge 10 20.2% 133
DMOPC '14 Contest 3 P5 - Not Enough Servers! DMOPC 20p 20.2% 208
CCO '08 P6 - Landing CCO 45 20.2% 40
DMOPC '20 Contest 4 P4 - Javelin Throwing DMOPC 15p 20.2% 56
DMOPC '18 Contest 3 P6 - Bob and Suffering DMOPC 30p 20.2% 8
CCO '20 P1 - A Game with Grundy CCO 10p 20.2% 215
Mock CCC '19 Contest 2 J4 - Tudor Buys Some Cheesecake Mock CCC 3p 20.2% 274
An Animal Contest 1 P6 - Alpaca Distancing AAC 12p 20.2% 109
COCI '22 Contest 3 #5 Skrivača COCI 20p 20.2% 17
COCI '21 Contest 1 #5 Volontiranje COCI 25p 20.2% 19
COCI '20 Contest 2 #2 Odašiljači COCI 10p 20.1% 47
When GCD meets XOR Uncategorized 17 20.1% 20
New Year's '17 P7 - Santa's Deliveries Seasonal 25p 20.1% 21
DMOPC '17 Contest 5 P2 - Mimi and Binary DMOPC 5p 20.1% 268
CCO '16 P6 - Pirates CCO 25p 20.1% 71
CEOI '17 P4 - Building Bridges CEOI 20p 20.1% 101
DMOPC '14 Contest 5 P3 - Brotherly Sequence DMOPC 5p 20.1% 301
Jason's Theorem Uncategorized 10p 20.1% 109
DMOPC '22 Contest 2 P3 - Good Permutations DMOPC 12p 20.0% 122
Wesley's Anger Contest 3 Problem 3 - Wesley Plays DDR WAC 7p 20.0% 360
IOI '08 P1 - Type Printer IOI 12p 20.0% 409
GFSSOC '15 Winter J3 - Christmas Presents GFSSOC 5p 20.0% 62
ECOO '15 R3 P2 - Tiling Trouble ECOO 15p 20.0% 2
Google Kickstart '17 Round C Problem C - Magical Thinking Google Kick Start 10p 20.0% 10
ICPC PACNW 2016 G - Maximum Islands ICPC 15 20.0% 5
COCI '19 Contest 5 #3 Matching COCI 35p 20.0% 5
ICPC NEERC 2010 B - Binary Operation ICPC 20p 20.0% 3
COCI '09 Contest 5 #3 Kletva COCI 7 20.0% 32
CCCHK '15 S4 - When to meet? CCC 15p 20.0% 8
Another Contest 7 Problem 4 - Team Assignments ACC 12p 20.0% 31
Attraction Uncategorized 10p 20.0% 74
COCI '20 Contest 3 #3 Sateliti COCI 17p 20.0% 36
COI '10 #4 Kamion COCI 30p 20.0% 1
COI '11 #4 Trampolin COCI 17 20.0% 7
Baltic OI '04 P6 - Car Park Baltic OI 25p 20.0% 1
COCI '22 Contest 2 #5 Kruhologija COCI 30p 20.0% 4