Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % ▾ Users
DMOPC '21 Contest 5 P6 - Permutations & Primes DMOPC 25p 6.2% 20
COI '09 #3 Loza COCI 20p 6.2% 17
DMPG '16 G1 - Explooooosion! DMOPC 15p 6.2% 95
Digit Sum Uncategorized 15 6.2% 9
DMOPC '21 Contest 6 P5 - Contraband Game DMOPC 25p 6.1% 11
NOI '15 P6 - Farm China NOI 25p 6.1% 6
CCC '02 S3 - Blindfold CCC 15 6.1% 150
Bubble Cup V8 A Fibonotci Bubble Cup 25 6.1% 4
String Finding - Hacking Uncategorized 10 6.1% 16
Sword Art Online Judge 2 Seasonal 10 6.1% 62
IOI '23 P5 - Overtaking IOI 25p 6.1% 11
DMOPC '19 Contest 1 P6 - Bob and Binary Strings DMOPC 25p 6.0% 11
DMOPC '21 Contest 8 P3 - Weaker Data DMOPC 25p 6.0% 15
다른 콘테스트 6 문제 5 - Fan Death ACC 0 6.0% 28
IOI '16 P6 - Aliens (Standard I/O) IOI 30p 6.0% 62
UTS Open '15 #5 - Distribution Channel Uncategorized 20p 6.0% 60
TLE '16 Contest 6 (Mock CCC) S2 - Paper Stapling TLE 10p 6.0% 41
TLE '17 Contest 3 P4 - Meatballs TLE 12p 5.9% 17
DMPG '15 B6 - Bad S'mores DMOPC 10p 5.9% 22
Back To School '17: Big Integer Seasonal 35p 5.9% 27
Mock CCC '23 1 S3 - Richard The Penguin Mock CCC 10p 5.9% 27
Guess the Sequence Uncategorized 3p 5.9% 185
UCRPC F21 I - Sphere Mongers ICPC 15p 5.8% 6
Another Contest 6 Problem 17 - Boolean (Lunatic) ACC 0p 5.8% 72
DMOPC '19 Contest 4 P6 - little_prince's Specialty Tea House DMOPC 25p 5.8% 16
Wesley's Anger Contest 6 Problem 6 (Hard Version) - Santa's Candy Factory WAC 20p 5.8% 17
CCO '20 P3 - Mountains and Valleys CCO 35p 5.8% 25
April Fools' Day Contest 1 P8 - NP-Hard Uncategorized 0 5.7% 25
DMOPC '22 Contest 3 P3 - Ina's Takodachis DMOPC 15p 5.7% 58
DWITE '10 R5 #4 - New type of wordplay DWITE 15 5.7% 14
NOI '10 P5 - Route Planning China NOI 35p 5.7% 2
JOI '19 Open P3 - Virus Experiment JOI 35p 5.7% 2
DMOPC '22 Contest 1 P5 - Wesley's Cabins DMOPC 30p 5.7% 7
Calendar Contest Problem 2 — Day of the Week Seasonal 10 5.7% 9
NOI '03 P6 - Wisdom Breaking Connection China NOI 25p 5.7% 5
Another Contest 10 Problem 2 - Wesley's Anger Contest 7 Problem 2 - Short Love Letters in CS ACC 0p 5.7% 7
Decoding Uncategorized 20 5.7% 51
Cheerio Contest 1 J5 - Arithmetic Sequence Uncategorized 10p 5.6% 22
NOI '22 P1 - Major China NOI 25p 5.6% 12
CCC '00 S5 - Sheep and Coyotes (Hard) CCC 20 5.6% 21
CCC '20 S2 - Escape Room (Hard) CCC 15p 5.6% 55
MWC '15 #8 P2: ASCII Art MWC 7 5.6% 8
COCI '07 Contest 2 #6 Pravokutni COCI 10 5.5% 34
Imperative French Uncategorized 15 5.5% 17
Mock CCC '22 2 S5 - Kaguya Wants to go Window Shopping with Kei Shirogane Mock CCC 30p 5.5% 5
Mock CCO '19 Contest 2 Problem 3 - A Cactus Problem Mock CCO 15p 5.5% 5
NOIP '04 P4 - Bugs Eating Computation China NOI 15p 5.5% 9
Canada Day Contest 2021 - Half Heart Seasonal 25 5.5% 8
Mock CCC '22 1 S5 - Berkeley Math Tournament Awards Ceremony Mock CCC 35p 5.5% 7
New Year's '19 P4 - A Button Challenge Seasonal 15p 5.5% 7