Problems

Problem search

Point range
Go Random
Problem Category ▴ Points AC % Users
A Plus B CBOJ 5p 47.3% 49
Hello, World! CBOJ 1 9.7% 71
Palindrome 1 - Check Palindrome CBOJ 3 36.8% 31
Palindrome 2 - Longest Palindrome (Easy) CBOJ 7 25.6% 35
Palindrome 3 - Longest Palindrome (Hard) CBOJ 15 17.3% 5
Subarray Sums CBOJ 7p 8.7% 8
Count Divisors (Extreme) CBOJ 15 6.5% 7
CBOJ Welcome Contest Problem 2 - Eating Candies CBOJ 5p 42.4% 28
CBOJ Welcome Contest Problem 4 - Remainder Table CBOJ 15p 5.7% 6
CBOJ Welcome Contest Problem 3 - Octomesters CBOJ 7p 17.5% 37
CBOJ Welcome Contest Problem 1 - Symmetric Encryption CBOJ 5p 21.1% 24
CBOJ Fall Contest Problem 4 - Taking an L CBOJ 12p 27.6% 7
CBOJ Fall Contest Problem 2 - Raking Leaves CBOJ 7p 21.5% 21
CBOJ Fall Contest Problem 3 - Maximum Social Distance CBOJ 12p 13.9% 11
CBOJ Fall Contest Problem 1 - Rule of Four CBOJ 7p 31.0% 19
CBOJ Winter Contest Problem 4 - Paint.NET CBOJ 12p 16.0% 14
CBOJ Winter Contest Problem 3 - Stacking Spacers CBOJ 12p 23.2% 16
CBOJ Winter Contest Problem 1 - Cyclic Isomers CBOJ 7p 46.4% 20
CBOJ Winter Contest Problem 2 - Suitcase Packing CBOJ 7p 21.3% 17
CBOJ Winter Contest Problem 2 - Suitcase Packing (Hard) CBOJ 10 18.7% 10
CBOJ Exec Selection Contest Problem 2 - Pretty Sequence CBOJ 15p 6.3% 6
CBOJ Exec Selection Contest Problem 4 - Bob and Books CBOJ 15p 12.1% 6
CBOJ Exec Selection Contest Problem 1 - Networking CBOJ 12p 26.0% 12
CBOJ Exec Selection Contest Problem 3 - Lucky Modulo 7 CBOJ 15p 18.6% 7
CBOJ Exec Selection Contest Problem 5 - Interesting Words CBOJ 15p 22.0% 5
CBOJ Exec Selection Contest Problem 6 - Cult CBOJ 17p 16.4% 4
Zeyu and Addition CBOJ 5 43.6% 14
Zeyu and Prefixes CBOJ 5 17.5% 13
Supply Drop CBOJ 20p 17.4% 1
Zeyu and Fireworks CBOJ 12p 17.1% 3
CBOJ 2022 Spring Contest Problem 2 - Allen's Asparagus CBOJ 5 12.9% 9
CBOJ 2022 Spring Contest Problem 5 - Draw me a Mountain Range CBOJ 17p 43.8% 3
CBOJ 2022 Spring Contest Problem 1 - KMP CBOJ 3 34.8% 19
CBOJ 2022 Spring Contest Problem 4 - Allen's Automata CBOJ 15p 11.5% 5
CBOJ 2022 Spring Contest Problem 3 - Martin's Monochromatic Marbles CBOJ 7p 24.2% 7
A CCC Preparation Problem CBOJ 1 33.7% 20
Mountain, Valley And Repeat CBOJ 17 30.6% 2
CBOJ 2023 Welcome Contest Problem 1 - Soccer League CBOJ 3 52.2% 12
The Perfect Gift CBOJ 7p 26.7% 6
CB Open 2024 Problem 4 - A Perfect Contest CBOJ 10 32.3% 5
CBOJ 2023 Welcome Contest Problem 4 - A Dream Problem CBOJ 10 12.5% 4
CBOJ 2023 Welcome Contest Problem 2 - Algebra Homework CBOJ 3 62.5% 10
CBOJ 2023 Welcome Contest Problem 3 - Finding "Amis" CBOJ 5 37.9% 10
Numbers On A Whiteboard CBOJ 10 15.4% 3
Menorah CBOJ 5 50.0% 12
Days To Break CBOJ 3 77.3% 16
Snow Removal CBOJ 5 21.4% 9
Santa's Route CBOJ 10 15.6% 3
CB Open 2024 Problem 1 - Studying for CS146 CBOJ 7 80.0% 5
CB Open 2024 Problem 3 - Another Number Theory Problem CBOJ 7 26.3% 6