Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▴ Users
NOIP '07 P3 - Removing Numbers from Matrix China NOI 15p 20.4% 22
Wesley's Anger Contest 3 Problem 4 - Canadian Construction Crew WAC 12p 20.4% 81
ICPC ECNA 2005 A - ACM (ACronym Maker) ICPC 12 20.4% 28
EGOI '23 P2 - Padel Prize Pursuit EGOI 10p 20.4% 32
NOI '05 P2 - Maintaining a Sequence China NOI 30p 20.4% 81
DWITE '07 R2 #5 - Bridges In A Graph DWITE 7 20.5% 344
CCC '22 J5 - Square Pool CCC 10p 20.5% 462
CCC '03 S1 - Snakes and Ladders CCC 5 20.5% 3105
Intervals Uncategorized 10p 20.5% 110
Brazilian IOI TST '19 Day 1 - Secret Santa Brazil OI 17p 20.5% 22
TLE '16 Contest 8 P3 - Fool's Sequence TLE 12p 20.5% 53
BlueBook - Cost BlueBook 3 20.5% 690
Substring Scoring Uncategorized 20p 20.5% 13
Rolling Encryption Uncategorized 10 20.5% 97
CCO '21 P3 - Through Another Maze Darkly CCO 25p 20.5% 49
ECOO '13 R3 P1 - Irregular Expressions ECOO 5p 20.5% 15
GFSSOC '17 J1 - Ramen and Studying GFSSOC 3p 20.5% 197
DMPG '18 G5 - Triangles DMOPC 15p 20.5% 29
DMOPC '15 Contest 1 P5 - Lelei and Dragon Scales DMOPC 10p 20.5% 386
BlueBook - Pay BlueBook 3 20.5% 377
DMOPC '14 Contest 1 P5 - Surprise Teleport DMOPC 7p 20.6% 531
2-D Permutations Uncategorized 10p 20.6% 158
DMPG '17 G4 - Timeline DMOPC 20p 20.6% 10
WC '16 Contest 4 S3 - Night Howlers Woburn Challenge 15p 20.6% 32
Wesley's Anger Contest 4 Problem 2 - Squirrel Election WAC 7p 20.6% 209
DMOPC '16 Contest 2 P2 - Ebola Outbreak DMOPC 7p 20.6% 432
CEOI '22 P1 - Abracadabra CEOI 20p 20.6% 41
DMPG '16 B2 - Reward Reminiscence DMOPC 3p 20.6% 165
An Animal Contest 4 P3 - Snowy Slopes AAC 10 20.6% 135
DMOPC '17 Contest 5 P4 - Intersecting Arcs DMOPC 17p 20.6% 61
Wesley's Anger Contest 1 Problem 3 - A Dynamic Tree Problem WAC 10p 20.6% 66
DMOPC '14 Contest 6 P6 - Trip DMOPC 17p 20.6% 17
APIO '13 P2 - Toll APIO 35p 20.6% 13
Good Travels Uncategorized 17 20.6% 70
Google Kickstart '17 Round A Problem A - Square Counting Google Kick Start 12p 20.6% 18
CCO '22 P4 - Bi-ing Lottery Treekets CCO 20p 20.6% 29
An Animal Contest 1 P3 - Happy Alpacas AAC 7p 20.6% 486
CCO '04 P2 - Hockey Scores CCO 12 20.6% 66
Triway Cup '18 Summer D - Demon Slayer Seasonal 20 20.7% 14
EGOI '21 P1 - Zeros EGOI 7p 20.7% 70
CCO '16 P6 - Pirates CCO 25p 20.7% 70
COCI '15 Contest 5 #6 Podnizovi COCI 30p 20.7% 5
COI '15 #3 Relay COCI 30p 20.7% 5
APIO '15 P1 - Bali Sculptures APIO 20p 20.7% 96
COCI '14 Contest 3 #4 Coci COCI 15p 20.7% 202
Monkey Country Uncategorized 10 20.7% 45
Singularity Cup P2 - Reverse Substring Partitioning Uncategorized 10 20.8% 234
CEOI '19 P4 - Amusement Park CEOI 30p 20.8% 7
DMOPC '21 Contest 3 P5 - Crowded Travels DMOPC 20p 20.8% 18
NOIP '21 P4 - Chess China NOI 20p 20.8% 7