Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users ▴
ECOO '19 R1 P4 - Bus Route ECOO 12 9.6% 12
DMPG '19 G6 - Pairs DMOPC 20p 25.0% 12
COCI '09 Contest 1 #6 Aladin COCI 25p 10.3% 12
IOI '19 P6 - Sky Walking IOI 40p 9.6% 12
OCC '19 S5 - Partitioning Olympiads School 12p 8.2% 12
DMOPC '19 Contest 2 P5 - Connections DMOPC 20 6.9% 12
NOI '19 P3 - Sequence China NOI 25p 8.5% 12
NOI '99 P1 - 01 Sequence China NOI 20p 25.9% 12
NOI '98 P2 - Free Pizza China NOI 15p 17.7% 12
NOI '08 P4 - Olympic Logistics China NOI 25p 27.0% 12
NOI '08 P2 - Course Design China NOI 30p 7.9% 12
NOI '09 P2 - Little G the Poet China NOI 25p 6.6% 12
Meta Classics 12p 34.1% 12
WC '15 Contest 3 S3 - Rescue Mission Woburn Challenge 15p 14.7% 12
WC '16 Finals S4 - Bug Infestation Woburn Challenge 20p 13.7% 12
WC '97 P2 - Power of Cryptography Woburn Challenge 20 12.1% 12
Wesley's Anger Contest 5 Problem 5 - A Squirrel's Life WAC 25p 7.6% 12
PEG Test '14 - Gift Delivery Uncategorized 10 14.1% 12
IOI '12 P6 - Jousting Tournament (Standard I/O) IOI 17p 16.7% 12
Revenge of the Clocks Uncategorized 15 50.0% 12
COCI '16 Contest 4 #4 Rekonstruiraj COCI 12p 10.7% 12
COCI '11 Contest 3 #2 D'hondt COCI 5p 38.3% 12
COCI '11 Contest 4 #2 Zima COCI 7p 18.6% 12
COCI '13 Contest 6 #3 Kockice COCI 7p 57.6% 12
COCI '13 Contest 6 #6 Graškrižja COCI 17p 11.0% 12
NOI '20 P2 - Destiny China NOI 25p 16.4% 12
NOI '22 Multi-Provincial Team Selection P1 - Preprocessor China NOI 10p 8.2% 12
CCO '22 P6 - Good Game CCO 35p 19.6% 12
APIO '22 P3 - Permutation APIO 20p 9.8% 12
Baltic OI '12 P1 - Brackets Baltic OI 15p 32.7% 12
Baltic OI '04 P1 - Ships Baltic OI 7p 14.4% 12
JOI '19 Open P2 - Remittance JOI 30p 23.8% 12
NOI '22 P1 - Major China NOI 25p 5.6% 12
Waterloo 2001 Fall 1 C - Babelfish Waterloo Local 5 28.9% 12
IOI '23 P3 - Soccer Stadium IOI 30p 4.7% 12
HHPC1 P5 - Yunity Grouping Objects Uncategorized 17p 34.1% 12
Amplitude Hackathon '23 Problem 6 - Journeys Uncategorized 10p 26.4% 12
COCI '23 Contest 5 #2 Bitovi COCI 10p 10.7% 12
COCI '23 Contest 5 #3 Piratski Kod COCI 15p 38.9% 12
Permutation Sorting Olympiads School 20p 15.6% 12
Infinity Card Decks Olympiads School 15p 16.9% 12
Mock CCC '15 S5 - Kongou Mock CCC 40p 3.9% 13
Facebook Hacker Cup '15 Round 3 P4 - Fox Rocks FHC 35p 42.1% 13
CCO '14 P6 - Gates CCO 40p 9.0% 13
CCO Preparation Test 5 P2 - Corporative Network Mock CCO 15 7.3% 13
ICPC ECNA 2016 H - Vin Diagrams ICPC 15 47.9% 13
TLE '16 Contest 6 (Mock CCC) J5 - Meal Plan TLE 10p 5.1% 13
Mock CCO '17 Problem 5 - Blitzkrieg Mock CCO 17p 12.4% 13
DWITE '08 R4 #5 - Blow your mind with 4th D DWITE 7 19.7% 13
DWITE '09 R7 #4 - What is this Algebra? DWITE 12 22.0% 13