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
CCC '04 S4 - Space Turtle
Educational DP Contest AtCoder L - Deque
A Game
ICPC PACNW 2016 A - Alphabet
Educational DP Contest AtCoder H - Grid 1
DMOPC '14 Contest 4 P3 - Golden Lily
Wesley's Anger Contest 1 Problem 5 - Rule of Four
Problem
Category
Points
AC %
Users ▴
DWITE '07 R5 #5 - Tetris!
DWITE
7
25.9%
6
DWITE '08 R5 #5 - Nash in Traffic
DWITE
10
25.8%
6
DWITE '11 R3 #3 - Combo Discounts
DWITE
5
70.0%
7
DWITE '11 R3 #2 - Magical Ponds
DWITE
5
30.0%
8
DWITE '10 R2 #2 - Seating Arrangement
DWITE
5
52.2%
8
DWITE '12 R5 #4 - Fencing Problems
DWITE
5
15.5%
9
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
DWITE '10 R4 #5 - Sleepwalking Probabilities
DWITE
5
71.4%
11
DWITE '09 R6 #3 - Bill Amendments
DWITE
5
25.5%
11
DWITE '07 R4 #5 - It all adds up
DWITE
7
57.1%
12
DWITE '08 R5 #4 - Wiring the Server Room
DWITE
15
22.6%
12
DWITE '08 R4 #5 - Blow your mind with 4th D
DWITE
7
19.7%
13
DWITE '09 R7 #4 - What is this Algebra?
DWITE
12
22.0%
13
DWITE '11 R4 #5 - Comet Vomit
DWITE
12
47.6%
14
DWITE '10 R5 #4 - New type of wordplay
DWITE
15
5.7%
14
DWITE '10 R2 #5 - Cogwheels
DWITE
7
25.3%
14
DWITE '08 R5 #3 - Working Directory
DWITE
7
45.9%
16
DWITE '10 R1 #4 - Planting Trees
DWITE
7
50.0%
16
DWITE '11 R4 #1 - Crossword Count
DWITE
5
54.8%
16
DWITE '09 R3 #4 - Spiral Out
DWITE
7
69.0%
17
DWITE '07 R3 #4 - The Convex Fence Company
DWITE
10
25.4%
17
DWITE '12 R2 #2 - Word Arithmetic
DWITE
5
30.9%
18
DWITE '11 R2 #4 - Bear Trees
DWITE
10
21.3%
18
DWITE '10 R2 #4 - Fractions to Decimal
DWITE
7
37.7%
18
DWITE '09 R5 #4 - Kind of like OCR
DWITE
7
46.3%
18
DWITE '11 R1 #3 - Take a Walk
DWITE
10
14.5%
18
DWITE '09 R2 #1 - Angles
DWITE
5
46.6%
18
DWITE '08 R1 #5 - Moving Stuff in Boxes
DWITE
7
43.5%
18
DWITE '10 R1 #5 - Ricochet Robot
DWITE
7
42.1%
19
DWITE '09 R5 #3 - Summary Diff
DWITE
5
61.8%
19
DWITE '11 R4 #3 - Breaking Bonds
DWITE
7
45.7%
20
DWITE '08 R2 #3 - My drink is made of cubes
DWITE
5
38.1%
21
DWITE '12 R5 #5 - Pattern Lock
DWITE
7
47.7%
21
DWITE '08 R5 #2 - Kill Dash Nine
DWITE
5
50.0%
21
DWITE '09 R2 #5 - Portals Redux
DWITE
12
39.7%
23
DWITE '10 R3 #1 - Integers along a line
DWITE
5
21.7%
24
DWITE '09 R5 #5 - Weak Passwords
DWITE
5
38.5%
26
DWITE '08 R3 #5 - Now in 3D
DWITE
7
78.7%
26
DWITE '09 R3 #3 - Binary Test Strings 2
DWITE
5
73.2%
27
DWITE '10 R4 #2 - Primal Numbers
DWITE
5
56.3%
28
DWITE '11 R3 #5 - Tautology
DWITE
10
39.7%
29
DWITE '08 R3 #3 - Unicorns and Teaspoons
DWITE
5
67.7%
31
DWITE '11 R2 #1 - Wandering Billy
DWITE
5
35.0%
31
DWITE '07 R4 #1 - Curve-shot
DWITE
5
56.1%
32
DWITE '08 R2 #5 - Water damage
DWITE
7
22.4%
32
DWITE '12 R5 #1 - Travel Time
DWITE
5
43.8%
32
DWITE '10 R4 #1 - Future Printer
DWITE
3
47.9%
33
«
1
2
3
4
»