Problems

Problem search

Point range
Go Random

Hot problems

Problem Category Points AC % Users ▾
BPC 1 S4 - Binary Matrices Uncategorized 25p 12.2% 9
NOIP '99 P4 - Stamp Face Value Design China NOI 12p 10.5% 9
Adaptive Mechanized Calcium Chlorohypochlorite Uncategorized 25 15.2% 9
Baltic OI '11 P7 - Polygon Baltic OI 17p 37.7% 9
DMOPC '22 Contest 1 P6 - Linear Swap DMOPC 30p 7.8% 9
JOI '21 Open P1 - Crossing JOI 20p 42.9% 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
DMPG '17 S4 - Artillery Battery DMOPC 15p 8.7% 8
MWC '15 #8 P2: ASCII Art MWC 7 5.6% 8
HCI '16 - Gifts Uncategorized 17p 37.5% 8
ECOO '13 R3 P3 - Go With the Flow ECOO 10p 41.7% 8
DWITE '11 R3 #2 - Magical Ponds DWITE 5 30.0% 8
DWITE '10 R2 #2 - Seating Arrangement DWITE 5 52.2% 8
ICPC PACNW 2016 B - Buggy Robot ICPC 10 25.7% 8
TLE '17 Contest 3 P6 - Donut Coupons TLE 25p 9.6% 8
Mock CCO '18 Contest 3 Problem 5 - Roger Outsources DMOJ Work Mock CCO 15p 11.2% 8
Mock CCO '18 Contest 3 Problem 6 - Roger Asks For More Marks Mock CCO 30p 15.5% 8
DMOPC '18 Contest 3 P6 - Bob and Suffering DMOPC 30p 20.2% 8
Mock CCC '19 Contest 2 S4 - Tudor Walks Among the Goats Mock CCC 25p 6.8% 8
CTU Open Contest 2018 - Escalators ICPC 15 45.5% 8
CEOI '18 P4 - Fibonacci Representations CEOI 40p 38.2% 8
Wesley's Anger Contest 1 Problem 7 - Arithmetic Subtrees WAC 30p 7.7% 8
Wesley's Anger Contest 1 Problem 6 - Colourful Cactus Ordeal WAC 25p 14.8% 8
CCO '98 P4 - Scoring Curling CCO 7p 25.0% 8
DMPG '19 G3 - A Round Problem DMOPC 20p 26.8% 8
Mock CCO '19 Contest 2 Problem 2 - A Simulation Problem Mock CCO 15p 10.7% 8
APIO '11 P3 - Guess My Word! APIO 30p 23.9% 8
Back From Summer '19 P4: Wesley And Cake Seasonal 25p 23.1% 8
Fast Factorial Calculator 3 Uncategorized 40 2.5% 8
Wesley's Anger Contest 3 Problem 6 - Zeyu's Sadness Contest 1 WAC 30p 7.5% 8
Another Contest 6 Problem 6 - Name That Song ACC 0p 0.6% 8
Another Contest 6 Problem 0 - Another Warmup Problem ACC 0 4.8% 8
Wesley's Anger Contest 4 Problem 5 - Time Travelling Squirrels WAC 30p 7.4% 8
Evan's Cube Uncategorized 12p 27.1% 8
Thog's Fortnite 2 Uncategorized 17p 15.2% 8
NOI '98 P4 - Scarf Cutting China NOI 15p 24.5% 8
And Password Uncategorized 20p 16.4% 8
WC '17 Contest 3 S3 - Down for Maintenance Woburn Challenge 15p 13.1% 8
WC '98 P2 - The Hutts Strike Back Woburn Challenge 10 45.5% 8
WC '01 P2 - The Island Of Dr. Strangelove Woburn Challenge 10 38.5% 8
WC '97 P3 - Stacks of Flapjacks Woburn Challenge 15p 31.4% 8
WC '17 Contest 4 S4 - Alpha Nerd Woburn Challenge 17p 18.0% 8
CCCHK '15 S4 - When to meet? CCC 15p 20.0% 8