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
...
48
49
50
51
52
53
...
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
Lil' Jami
CCC '24 S2 - Heavy-Light Composition
CCC '14 S1 - Party Invitation
CCC '19 S2 - Pretty Average Primes
CCO '07 P2 - Snowflakes
Wesley's Anger Contest Reject 5 - Two Permutations
COCI '10 Contest 2 #2 Napor
Problem ▾
Category
Points
AC %
Users
DWITE '11 R2 #3 - Anonymous Shopping
DWITE
5
40.0%
10
DWITE '11 R2 #2 - Scratch Card
DWITE
5
29.5%
35
DWITE '11 R2 #1 - Wandering Billy
DWITE
5
35.0%
31
DWITE '11 R1 #5 - Tattarrattat
DWITE
10
59.0%
147
DWITE '11 R1 #4 - C001 Numbers
DWITE
3
28.1%
85
DWITE '11 R1 #3 - Take a Walk
DWITE
10
14.5%
18
DWITE '11 R1 #2 - Penny Game
DWITE
5
24.3%
112
DWITE '11 R1 #1 - Arab-lish Numbers
DWITE
5
29.2%
45
DWITE '10 R5 #5 - Cube World
DWITE
12
26.3%
111
DWITE '10 R5 #4 - New type of wordplay
DWITE
15
5.7%
14
DWITE '10 R5 #3 - Balancing Act
DWITE
7
39.3%
165
DWITE '10 R5 #2 - Safe from Rooks
DWITE
5
32.4%
210
DWITE '10 R5 #1 - Colourful Words
DWITE
5
52.7%
41
DWITE '10 R4 #5 - Sleepwalking Probabilities
DWITE
5
71.4%
11
DWITE '10 R4 #4 - Mountain Hiking
DWITE
7
38.5%
72
DWITE '10 R4 #3 - Binary Weight
DWITE
5
21.3%
36
DWITE '10 R4 #2 - Primal Numbers
DWITE
5
56.3%
28
DWITE '10 R4 #1 - Future Printer
DWITE
3
47.9%
33
DWITE '10 R3 #5 - E-Searching
DWITE
7
42.4%
10
DWITE '10 R3 #4 - Forest Fires
DWITE
7
40.3%
127
DWITE '10 R3 #3 - Dominos Tiling
DWITE
10
46.3%
266
DWITE '10 R3 #2 - Unit rectangles
DWITE
5
54.5%
52
DWITE '10 R3 #1 - Integers along a line
DWITE
5
21.7%
24
DWITE '10 R2 #5 - Cogwheels
DWITE
7
25.3%
14
DWITE '10 R2 #4 - Fractions to Decimal
DWITE
7
37.7%
18
DWITE '10 R2 #3 - Escape and Loot
DWITE
5
34.4%
95
DWITE '10 R2 #2 - Seating Arrangement
DWITE
5
52.2%
8
DWITE '10 R2 #1 - Pattern Matching
DWITE
3
40.1%
89
DWITE '10 R1 #5 - Ricochet Robot
DWITE
7
42.1%
19
DWITE '10 R1 #4 - Planting Trees
DWITE
7
50.0%
16
DWITE '10 R1 #3 - Power tiles
DWITE
5
68.7%
135
DWITE '10 R1 #2 - Robot Vacuum Prototype
DWITE
3
38.1%
58
DWITE '10 R1 #1 - Age Gate
DWITE
3
33.1%
210
DWITE '09 R7 #5 - Snapper Chain
DWITE
10
51.1%
74
DWITE '09 R7 #4 - What is this Algebra?
DWITE
12
22.0%
13
DWITE '09 R7 #3 - Oil Spill Area
DWITE
7
53.4%
80
DWITE '09 R7 #2 - Sum of Primes
DWITE
5
55.3%
348
DWITE '09 R7 #1 - Binary Equipment
DWITE
3
43.5%
105
DWITE '09 R6 #5 - Air Travel Planning
DWITE
7
61.0%
118
DWITE '09 R6 #4 - Time for Change
DWITE
7
57.9%
209
DWITE '09 R6 #3 - Bill Amendments
DWITE
5
25.5%
11
DWITE '09 R6 #2 - Round to power of two
DWITE
3
50.3%
181
DWITE '09 R6 #1 - ROT13 Encryption
DWITE
3
48.2%
95
DWITE '09 R5 #5 - Weak Passwords
DWITE
5
38.5%
26
DWITE '09 R5 #4 - Kind of like OCR
DWITE
7
46.3%
18
DWITE '09 R5 #3 - Summary Diff
DWITE
5
61.8%
19
DWITE '09 R5 #2 - Round to Second Prime
DWITE
5
57.2%
250
DWITE '09 R5 #1 - ASCII bar graphs
DWITE
3
66.2%
136
DWITE '09 R4 #5 - Ice Maze
DWITE
10
51.2%
36
DWITE '09 R4 #4 - Autocomplete
DWITE
7
61.5%
45
«
1
2
...
48
49
50
51
52
53
...
99
100
»