Home
Problems
Submissions
Users
Contests
About
>
Status
Tips
API
Github
Log in
or
Sign up
This site works best with JavaScript enabled.
Problems
«
1
2
3
4
5
6
...
99
100
»
Problem search
Full text search
Has editorial
Show problem types
Category
All
---
AAC
ACC
APIO
Balkan OI
Baltic OI
BlueBook
Brazil OI
Bubble Cup
Bulgarian OI
CCC
CCO
CEOI
China NOI
Classics
COCI
CSPC
CTF
Data Structure Tests
DMOPC
DWITE
ECOO
EGOI
ESOI
FHC
Fun Math
GFSSOC
Google Code Jam
Google Hash Code
Google Kick Start
ICPC
IOI
JOI
Mock CCC
Mock CCO
MWC
Olympiads School
POI
SAC Coding Challenge
Seasonal
SIUCF
Taiwan NOI
TLE
TSOC
Uncategorized
VM7WC
WAC
Waterloo Local
Woburn Challenge
YAC
Point range
Go
Random
Hot problems
BlueBook - 10 Primes on a Line
Baltic OI '05 P3 - Maze
CCC '00 S1 - Slot Machines
Single Source Shortest Path
Educational DP Contest AtCoder D - Knapsack 1
CCC '24 J5 - Harvest Waterloo
IOI '11 P2 - Race (Standard I/O)
Problem
Category
Points
AC % ▾
Users
Max's Anger Contest Series 2 P2 - Password Anger
Seasonal
5p
69.0%
150
SAC '22 Code Challenge 1 P1 - That Teacher
SAC Coding Challenge
3
69.0%
597
DWITE '09 R3 #4 - Spiral Out
DWITE
7
69.0%
17
COCI '22 Contest 1 #1 Desni Klik
COCI
5p
68.9%
141
COCI '10 Contest 6 #2 Uspon
COCI
5p
68.8%
49
DMOPC '20 Contest 1 P1 - Victor Gets Quizzed
DMOPC
3
68.8%
523
DWITE '10 R1 #3 - Power tiles
DWITE
5
68.7%
135
UCRPC F21 B - Lost in the Shuffle
ICPC
3
68.7%
87
WOSS Dual Olympiad 2023 J1: Minimum Price
Uncategorized
3
68.6%
173
WC '17 Contest 1 J2 - How's the Weather?
Woburn Challenge
3
68.6%
3733
SAC '22 Code Challenge 3 Junior P3 - Normal Probabilities
SAC Coding Challenge
3p
68.6%
250
DWITE '07 R2 #3 - Floor Plan
DWITE
7
68.6%
124
Google Code Jam '08 Round 1A Problem A - Minimum Scalar Product
Google Code Jam
5p
68.4%
11
BSSPC '22 P1 - Bubble Tea Tracker
Uncategorized
3
68.4%
539
SAC '22 Code Challenge 5 Junior P1 - Monkey, Type!
SAC Coding Challenge
3
68.3%
252
A Math Contest P15 - Matrix Fixed Point
Uncategorized
20
68.3%
30
DMOPC '19 Contest 5 P0 - Concurrent Competitor Counting
DMOPC
3
68.2%
393
ECOO '16 R3 P4 - Cuthbert's Calculator
ECOO
15p
68.2%
5
COCI '15 Contest 3 #1 Pot
COCI
5
68.0%
207
DMOJ Capture The Flag '20 G1 - Sanity Check
CTF
3
68.0%
338
COCI '09 Contest 2 #1 Faktor
COCI
3p
67.9%
323
COCI '12 Contest 6 #1 Baka
COCI
3p
67.7%
88
COCI '16 Contest 5 #1 Tuna
COCI
3p
67.7%
62
DWITE '08 R3 #3 - Unicorns and Teaspoons
DWITE
5
67.7%
31
COCI '11 Contest 6 #2 Prozori
COCI
5
67.6%
23
COCI '20 Contest 6 #1 Bold
COCI
5p
67.4%
163
SAC '22 Code Challenge 3 Junior P2 - Normal Lines
SAC Coding Challenge
3p
67.4%
283
Mock CCC '23 Contest 1 J1 - Final Velocity
Mock CCC
3
67.3%
732
WC '18 Contest 1 J2 - Making the Cut
Woburn Challenge
3p
67.2%
204
COCI '23 Contest 4 #1 Bingo
COCI
5p
67.0%
65
WC '17 Contest 2 J1 - The Rings of Power
Woburn Challenge
3
66.9%
302
ICPC SWERC 2017 F - Shattered Cake
ICPC
3
66.9%
55
ECOO '12 R2 P4 - Lo Shudoku
ECOO
10p
66.7%
5
ECOO '12 R3 P4 - Splitsville
ECOO
10p
66.7%
2
Waterloo 2017 Fall E - English
Waterloo Local
15p
66.7%
4
COCI '09 Contest 6 #1 Kajak
COCI
5p
66.7%
82
COCI '10 Contest 3 #6 Mono
COCI
12p
66.7%
6
NOIP '18 Junior P1 - Title Statistics
China NOI
3p
66.7%
52
Google Code Jam '08 Round 1A Problem B - Milkshakes
Google Code Jam
7p
66.7%
2
Google Code Jam '13 Qualification Round Problem A - Tic-Tac-Toe-Tomek
Google Code Jam
7p
66.7%
5
Google Code Jam '14 Round 1A Problem A - Charging Chaos
Google Code Jam
7p
66.7%
2
Google Code Jam '14 Round 1A Problem B - Full Binary Tree
Google Code Jam
10p
66.7%
3
Google Code Jam '16 Qualification Round Problem B - Revenge of the Pancakes
Google Code Jam
5p
66.7%
2
Google Code Jam '16 Round 1A Problem A - The Last Word
Google Code Jam
5p
66.7%
4
Google Code Jam '16 Round 1A Problem B - Rank and File
Google Code Jam
7p
66.7%
2
Google Code Jam '16 Round 1A Problem C - BFFs
Google Code Jam
10p
66.7%
2
Google Code Jam '17 Qualification Round Problem C - Bathroom Stalls
Google Code Jam
10p
66.7%
2
Google Code Jam '17 Round 1A Problem B - Ratatouille
Google Code Jam
12
66.7%
3
Google Code Jam '18 Round 1A Problem A - Waffle Choppers
Google Code Jam
10p
66.7%
4
Google Code Jam '22 Round 1B Problem B - Controlled Inflation
Google Code Jam
10p
66.7%
4
«
1
2
3
4
5
6
...
99
100
»