Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▴ Users
Lexicographically Least Substring Uncategorized 5 46.0% 616
ECOO '15 R3 P1 - Just the Factoradics, Ma'am ECOO 7p 46.0% 35
CCC '97 S2 - Nasty Numbers CCC 5 46.0% 797
Facebook Hacker Cup '15 Round 1 P4 - Corporate Gifting FHC 17 46.0% 88
COCI '20 Contest 3 #2 Vlak COCI 10p 46.0% 49
COCI '08 Contest 4 #2 Datum COCI 3 46.0% 323
COCI '08 Contest 2 #1 Kornislav COCI 5 46.1% 398
DWITE '09 R3 #1 - Quiz Time DWITE 3 46.1% 97
COCI '16 Contest 5 #4 Ronald COCI 12p 46.1% 29
CCC '19 S1 - Flipper CCC 3p 46.1% 3959
COCI '14 Contest 7 #1 Teta COCI 5p 46.1% 99
DWITE '10 R3 #3 - Dominos Tiling DWITE 10 46.1% 290
CTU Open Contest 2017 - Ice Cream Samples ICPC 12 46.2% 5
CTU Open Contest 2017 - Go Northwest! ICPC 7 46.2% 9
COI '12 #3 Snjeguljica COCI 17p 46.2% 21
Google Code Jam '21 Qualification Round Problem B - Moons and Umbrellas Google Code Jam 7p 46.2% 6
VMSS Pre-Pre-Windsor P2 - Big Chess Uncategorized 3 46.2% 416
CCC '19 J3 - Cold Compress CCC 5 46.2% 3166
UHCC1 P2 - String Uncategorized 5 46.3% 106
Tree Paths Uncategorized 12p 46.3% 9
Waterloo 2017 Winter D - Vera and Sorting Waterloo Local 15 46.3% 29
CTU Open Contest 2017 - Punching Power ICPC 15 46.3% 15
TSOC '15 Contest 2 #5 - Bebiliths TSOC 5p 46.4% 209
ECOO '20 P2 - Online Shopping ECOO 5p 46.4% 372
IOI '09 P5 - Garage IOI 7 46.4% 532
NOI '08 P3 - Hiring Employees China NOI 25p 46.4% 41
Cheerio Contest 1 S5 - Coin Game Uncategorized 15p 46.4% 35
ICPC ECNA 2016 C - The Key to Cryptography ICPC 7 46.4% 61
COCI '08 Regional #6 Cvjetici COCI 12 46.5% 180
CCC '06 S4 - Groups CCC 10 46.5% 328
Checkerboard Summation (Hard) Uncategorized 15p 46.5% 243
DWITE '09 R2 #1 - Angles DWITE 5 46.6% 18
COCI '14 Contest 5 #3 Traktor COCI 7p 46.6% 278
NOIP '07 P1 - Counting Numbers China NOI 3p 46.6% 58
Waterloo 2017 Fall A - Art Waterloo Local 3p 46.6% 109
GlobeX Cup '18 S Sample - Chair Stacking Uncategorized 7p 46.6% 127
An Animal Contest 5 P1 - Bamboo Cookies AAC 3p 46.6% 593
IOI '03 Practice Task 1 - Balancing Act IOI 15 46.6% 125
ECOO '15 R2 P3 - Lucas' Other Tower ECOO 10p 46.7% 308
ECOO '14 R3 P1 - Substitute Teacher ECOO 5p 46.7% 21
CCO '97 P5 - Space Aliens CCO 10 46.7% 3
CCO '98 P6 - Derek's Dilemma CCO 12 46.7% 4
COCI '17 Contest 7 #4 Clickbait COCI 15p 46.7% 6
IOI '12 P4 - Ideal City (Standard I/O) IOI 25p 46.7% 6
COCI '13 Contest 3 #5 Parovi COCI 12p 46.7% 16
COCI '11 Contest 5 #1 Križaljka COCI 3p 46.7% 54
NOI '23 P4 - Trade China NOI 20p 46.7% 7
DMOPC '18 Contest 1 P0 - Sorting DMOPC 3 46.7% 561
DWITE '09 R6 #1 - ROT13 Encryption DWITE 3 46.7% 98
DMOPC '18 Contest 2 P0 - Mimi and Video Games DMOPC 3 46.7% 422