Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users ▴
COI '14 #4 Sir COCI 25p 27.9% 9
BPC 1 S4 - Binary Matrices Uncategorized 25p 12.2% 9
Adaptive Mechanized Calcium Chlorohypochlorite Uncategorized 25 15.2% 9
Baltic OI '11 P7 - Polygon Baltic OI 17p 35.7% 9
DMOPC '22 Contest 1 P6 - Linear Swap DMOPC 30p 7.8% 9
JOI '21 Open P1 - Crossing JOI 20p 42.9% 9
JOI '21 Spring Camp Day 4 P1 - Event Hopping 2 JOI 30p 63.2% 9
MCIPC Contest 2 P6 - Block Tower Uncategorized 12p 11.6% 9
Lyndon's Golf Contest 1 P6 - Alphanumeric Perl Uncategorized 0p 9.3% 9
NOIP '04 P4 - Bugs Eating Computation China NOI 15p 5.5% 9
Google Code Jam '21 Qualification Round Problem C - Reversort Engineering Google Code Jam 7p 27.5% 9
Waterloo 2016 Fall C - Wizard of Odds Waterloo Local 5 34.3% 9
NOI '17 P2 - Queue China NOI 20p 45.3% 9
Capture The Flag 2 Uncategorized 12 56.3% 9
Cryptic Tile Forge Uncategorized 0 24.3% 9
Guessing Game Uncategorized 5p 37.6% 9
Phantom's Python Challenge Uncategorized 40p 0.8% 10
CCO '07 P5 - Particle Catcher CCO 30p 16.3% 10
CCO Preparation Test 1 P1 - Double Cross Mock CCO 20p 12.1% 10
ECOO '15 R2 P2 - So So ECOO 12p 17.2% 10
ECOO '16 R3 P1 - Nerd Poker ECOO 7p 12.2% 10
COCI '15 Contest 2 #6 Država COCI 25 24.2% 10
ICPC NAQ 2016 B - Arcade! ICPC 15 24.8% 10
TLE '16 Contest 7 P2 - Judging TLE 15p 14.2% 10
TLE '16 Contest 7 P5 - Shortest Path Faster Algorithm TLE 20p 2.8% 10
Google Kickstart '17 Round C Problem C - Magical Thinking Google Kick Start 10p 20.0% 10
DWITE '07 R4 #3 - Don't follow my links DWITE 5 54.9% 10
DWITE '10 R3 #5 - E-Searching DWITE 7 42.4% 10
DWITE '12 R1 #5 - Haunted House DWITE 10 44.4% 10
DWITE '11 R2 #3 - Anonymous Shopping DWITE 5 40.0% 10
TLE '17 Contest 2 P5 - Crew Selection Test TLE 25p 7.8% 10
DMOPC '17 Contest 4 P6 - Best Girl DMOPC 25p 15.4% 10
Heap Dijkstra Revisited Data Structure Tests 10 14.3% 10
CTU Open Contest 2017 - Shooting Gallery ICPC 10 17.0% 10
ECOO '18 R2 P4 - Three Squares ECOO 15p 35.1% 10
IOI '18 P6 - Meetings IOI 35p 12.0% 10
Inaho VIII Uncategorized 20 36.6% 10
DMOPC '18 Contest 4 P6 - Dr. Henri and Resistor Chains DMOPC 20p 4.2% 10
Valentine's Day '19 S5 - A Top Tree Problem Uncategorized 25p 9.7% 10
CTU Open Contest 2018 - Rullete ICPC 10 19.4% 10
COCI '18 Contest 1 #5 Teoretičar COCI 35p 31.7% 10
COCI '18 Contest 6 #2 Konj COCI 7p 61.1% 10
CPC '19 Contest 1 P6 - Maintaining Some Coins Uncategorized 20p 1.9% 10
CCO '99 P6 - Fast Food CCO 15 34.4% 10
DMPG '19 G4 - Carpet Cleaning Chore DMOPC 12p 13.0% 10
Wesley's Anger Contest 2 Problem 5 - Oober Treats WAC 25 21.6% 10
Bohemian Rhaksody Uncategorized 45p 5.0% 10
Wesley++ Seasonal 15p 15.2% 10
COCI '19 Contest 2 #1 ACM COCI 5p 52.4% 10
Tootsie Rolls Classics 12p 22.2% 10