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
DMOPC '21 Contest 9 P5 - Chika Circle
Problem
Category
Points
AC %
Users ▾
DWITE '06 R5 #2 - Floppy Disk
DWITE
7p
56.4%
106
DWITE '09 R7 #1 - Binary Equipment
DWITE
3
43.5%
105
DWITE '09 R1 #4 - My First True Letter
DWITE
3
38.1%
104
DWITE '08 R1 #2 - Simple Checksum
DWITE
3
51.0%
103
DWITE '07 R5 #3 - Parity bit
DWITE
5
71.0%
102
DWITE '12 R2 #1 - Sugar Rush
DWITE
3
30.4%
101
DWITE '09 R4 #1 - Social Media Overload
DWITE
3
65.9%
100
DWITE '06 R5 #3 - UPC Check Digit
DWITE
5
38.0%
100
DWITE '07 R1 #3 - Where's my QWERTY?
DWITE
3
41.3%
98
DWITE '09 R3 #1 - Quiz Time
DWITE
3
46.1%
97
DWITE '09 R6 #1 - ROT13 Encryption
DWITE
3
48.2%
95
DWITE '10 R2 #3 - Escape and Loot
DWITE
5
34.4%
95
DWITE '02 R2 #3 - The Game of Life
DWITE
7
52.0%
95
DWITE '11 R5 #2 - Forest Fires
DWITE
7
39.6%
93
DWITE '02 R2 #1 - Sales!
DWITE
5
31.8%
91
DWITE '09 R2 #2 - Mini DWITE
DWITE
3
31.7%
90
DWITE '10 R2 #1 - Pattern Matching
DWITE
3
40.1%
89
DWITE '12 R1 #1 - Candy Piles
DWITE
3
36.0%
88
DWITE '11 R1 #4 - C001 Numbers
DWITE
3
28.1%
85
DWITE '07 R4 #2 - And the winner is...
DWITE
5
35.3%
81
DWITE '08 R2 #4 - Big shiny tunes
DWITE
7
63.3%
80
DWITE '09 R7 #3 - Oil Spill Area
DWITE
7
55.0%
79
DWITE '06 R5 #1 - Points on a Line
DWITE
7
36.3%
77
DWITE '09 R7 #5 - Snapper Chain
DWITE
10
51.1%
74
DWITE '07 R5 #1 - I heart you
DWITE
3
31.4%
74
DWITE '11 R4 #4 - Lego Ladder
DWITE
10
29.3%
74
DWITE '11 R3 #4 - ABCA Maze
DWITE
7
54.1%
73
DWITE '08 R4 #2 - Tic Tac Win
DWITE
5
43.3%
73
DWITE '10 R4 #4 - Mountain Hiking
DWITE
7
38.5%
72
DWITE '11 R5 #3 - Unit rectangles
DWITE
3
51.7%
71
DWITE '11 R5 #4 - Cube World
DWITE
12
46.3%
70
DWITE '09 R1 #1 - iProfits
DWITE
3
49.3%
62
DWITE '08 R2 #1 - My shiny digital key
DWITE
3
38.5%
61
DWITE '08 R4 #1 - Four player Pong with no players
DWITE
7
71.9%
58
DWITE '10 R1 #2 - Robot Vacuum Prototype
DWITE
3
38.1%
58
DWITE '09 R4 #3 - Moving at the same time
DWITE
5
31.2%
57
DWITE '02 R2 #4 - Money Prize
DWITE
10
42.0%
57
DWITE '08 R1 #1 - LaNDscAPE ii
DWITE
3
64.1%
54
DWITE '08 R4 #3 - Secret party
DWITE
7
37.9%
54
DWITE '10 R3 #2 - Unit rectangles
DWITE
5
54.5%
52
DWITE '12 R1 #3 - Costume Party
DWITE
5
43.7%
50
DWITE '08 R3 #1 - ASCII Rhombus
DWITE
5
70.3%
47
DWITE '08 R1 #3 - School's a maze
DWITE
7
49.1%
47
DWITE '12 R2 #5 - Car Hoppers
DWITE
7
29.8%
46
DWITE '09 R4 #4 - Autocomplete
DWITE
7
61.5%
45
DWITE '11 R1 #1 - Arab-lish Numbers
DWITE
5
29.2%
45
DWITE '12 R1 #2 - Candybar Graphs
DWITE
5
59.6%
44
DWITE '11 R3 #1 - Weighted Presents
DWITE
3
56.0%
44
DWITE '09 R4 #2 - Verifying Distributed Work
DWITE
3
31.1%
43
DWITE '07 R1 #5 - Velociraptor Maze
DWITE
7
13.3%
42
«
1
2
3
4
»