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
»
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
COCI '14 Contest 6 #4 Kratki
CCO '23 P1 - Binaria
Wesley's Anger Contest 1 Problem 5 - Rule of Four
CCOQR '16 - Stupendous Bowties
Educational DP Contest AtCoder B - Frog 2
CCC '04 S4 - Space Turtle
CCC '17 S3 - Nailed It!
Problem
Category
Points
AC % ▴
Users
DWITE '10 R5 #4 - New type of wordplay
DWITE
15
5.7%
14
DWITE '07 R1 #5 - Velociraptor Maze
DWITE
7
13.3%
42
DWITE '11 R2 #5 - Portals Check
DWITE
7
13.7%
159
DWITE '11 R1 #3 - Take a Walk
DWITE
10
14.5%
18
DWITE '12 R5 #4 - Fencing Problems
DWITE
5
15.5%
9
DWITE '07 R1 #2 - Cubes in a Pyramid
DWITE
3p
17.6%
344
DWITE '08 R4 #5 - Blow your mind with 4th D
DWITE
7
19.7%
13
DWITE '09 R1 #5 - Running In Circles
DWITE
7
19.9%
316
DWITE '07 R2 #5 - Bridges In A Graph
DWITE
7
20.5%
344
DWITE '10 R4 #3 - Binary Weight
DWITE
5
21.3%
36
DWITE '11 R2 #4 - Bear Trees
DWITE
10
21.6%
19
DWITE '10 R3 #1 - Integers along a line
DWITE
5
21.7%
24
DWITE '11 R5 #5 - Binary Weight
DWITE
5
21.8%
34
DWITE '09 R7 #4 - What is this Algebra?
DWITE
12
22.0%
13
DWITE '08 R2 #5 - Water damage
DWITE
7
22.4%
32
DWITE '08 R5 #4 - Wiring the Server Room
DWITE
15
22.6%
12
DWITE '12 R1 #4 - Trick or Tree'ing
DWITE
5
23.1%
262
DWITE '07 R2 #4 - All Is Balanced
DWITE
5
23.2%
252
DWITE '11 R1 #2 - Penny Game
DWITE
5
24.3%
112
DWITE '06 R5 #5 - Prime Palindromes
DWITE
10
24.5%
211
DWITE '07 R1 #1 - Vanilla Primes
DWITE
3
24.6%
645
DWITE '10 R2 #5 - Cogwheels
DWITE
7
25.3%
14
DWITE '07 R3 #4 - The Convex Fence Company
DWITE
10
25.4%
17
DWITE '09 R6 #3 - Bill Amendments
DWITE
5
25.5%
11
DWITE '08 R5 #5 - Nash in Traffic
DWITE
10
25.8%
6
DWITE '07 R5 #5 - Tetris!
DWITE
7
25.9%
6
DWITE '10 R5 #5 - Cube World
DWITE
12
26.3%
111
DWITE '11 R1 #4 - C001 Numbers
DWITE
3
28.1%
85
DWITE '11 R1 #1 - Arab-lish Numbers
DWITE
5
29.2%
45
DWITE '11 R4 #4 - Lego Ladder
DWITE
10
29.3%
74
DWITE '11 R2 #2 - Scratch Card
DWITE
5
29.5%
35
DWITE '12 R2 #5 - Car Hoppers
DWITE
7
29.8%
46
DWITE '12 R5 #2 - Copycat SMS
DWITE
5
29.8%
135
DWITE '11 R3 #2 - Magical Ponds
DWITE
5
30.0%
8
DWITE '07 R3 #2 - There's An Essay In My Code
DWITE
5
30.2%
222
DWITE '12 R2 #1 - Sugar Rush
DWITE
3
30.4%
101
DWITE '12 R2 #2 - Word Arithmetic
DWITE
5
30.9%
18
DWITE '02 R2 #2 - The Five M's of Stats 101
DWITE
5
31.1%
111
DWITE '09 R4 #2 - Verifying Distributed Work
DWITE
3
31.1%
43
DWITE '09 R4 #3 - Moving at the same time
DWITE
5
31.2%
57
DWITE '07 R5 #1 - I heart you
DWITE
3
31.4%
74
DWITE '09 R2 #2 - Mini DWITE
DWITE
3
31.7%
90
DWITE '02 R2 #1 - Sales!
DWITE
5
31.8%
91
DWITE '10 R5 #2 - Safe from Rooks
DWITE
5
32.4%
210
DWITE '10 R1 #1 - Age Gate
DWITE
3
33.1%
210
DWITE '09 R2 #4 - Breadth First Not Quite Tree
DWITE
5
33.4%
150
DWITE '12 R5 #3 - Triangle Count
DWITE
7
33.4%
162
DWITE '10 R2 #3 - Escape and Loot
DWITE
5
34.4%
95
DWITE '07 R2 #2 - Show Me The Money!
DWITE
3
34.8%
151
DWITE '12 R2 #3 - Bitstrings
DWITE
3
34.8%
117
«
1
2
3
4
»