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
...
35
36
37
38
39
40
...
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
CCC '24 S2 - Heavy-Light Composition
CCC '12 S2 - Aromatic Numbers
The Cosmic Era P2 - Uneven Sand
Problem
Category
Points
AC %
▴
Users
WC '99 P5 - Good Will Hunting
Woburn Challenge
5
16.8%
86
WC '02 P8 - Deploying Troops
Woburn Challenge
7
18.0%
44
WC '01 Suicidal P6 - Blind Date
Woburn Challenge
20p
32.8%
10
WC '02 P1 - A Planning Session
Woburn Challenge
5
16.7%
62
WC '02 P10 - The Final Battle
Woburn Challenge
10
23.5%
19
WC '07 P3 - Strategy Meeting
Woburn Challenge
10
20.2%
133
CCCHK '15 S1 - Finding number of pairs
CCC
7p
13.7%
142
CCCHK '15 S2 - Matching Problem
CCC
10p
4.9%
14
CCCHK '15 S3 - Symmetric Cross
CCC
12p
16.2%
20
CCCHK '15 S4 - When to meet?
CCC
15p
20.0%
8
CCCHK '15 S5 - Can I pass the courses?
CCC
25p
5.0%
6
Fast LCA (Hard)
Uncategorized
17
8.7%
7
Temple Construction
Uncategorized
20p
14.5%
4
Sum Maximization
Uncategorized
10p
22.8%
47
Casino Crisis
Uncategorized
12p
33.8%
56
Baltic OI '17 P6 - Cat in a tree
Baltic OI
15p
35.0%
107
Baltic OI '17 P4 - Friends
Baltic OI
35p
25.0%
5
Baltic OI '17 P5 - Plus Minus
Baltic OI
15p
38.5%
27
Baltic OI '17 P1 - Political Development
Baltic OI
25p
23.2%
29
Baltic OI '17 P3 - Railway
Baltic OI
17p
34.6%
76
Baltic OI '17 P2 - Toll
Baltic OI
20p
47.6%
40
DMOJ Capture The Flag '20 R3 - Harder Assembly
CTF
7
29.4%
14
DMOJ Capture The Flag '20 R4 - Python Cycles
CTF
12
41.9%
13
DMOJ Capture The Flag '20 B2 - Strings
CTF
7
16.5%
23
DMOJ Capture The Flag '20 B3 - Classic Buffer Overflow
CTF
7
10.7%
25
Baltic OI '16 P1 - Bosses
Baltic OI
10p
41.4%
37
Baltic OI '16 P2 - Park
Baltic OI
20p
51.7%
11
Baltic OI '16 P3 - Spiral
Baltic OI
30p
13.3%
4
Baltic OI '16 P4 - Cities
Baltic OI
15p
32.1%
25
Baltic OI '16 P6 - Swap
Baltic OI
15p
30.3%
7
Baltic OI '16 P5 - Maze
Baltic OI
25p
2.3%
8
Maximum Independent Subset
Uncategorized
15p
12.6%
10
Necroposting
Uncategorized
5
51.5%
41
BlueBook - Max is Last
BlueBook
3
41.1%
507
BlueBook - Times Tables
BlueBook
3
54.3%
1481
BlueBook - Change
BlueBook
3
9.0%
195
BlueBook - Interest
BlueBook
3
28.5%
574
Sudoku Challenge
Uncategorized
7p
15.4%
63
Mock DWITE '09 P4 - Lights Out!
Uncategorized
15p
21.6%
34
Foxlings
Uncategorized
10p
14.5%
76
System Solver
Uncategorized
15
9.8%
34
Secret Room
Uncategorized
25p
8.4%
26
What a Niche
Uncategorized
10p
13.3%
16
PEG Test '14 - Gift Delivery
Uncategorized
10
14.1%
12
Security Cameras
Uncategorized
20
30.8%
43
Economy
Uncategorized
3
44.7%
81
Non-space-separated
Uncategorized
10
30.4%
44
Advanced Battleships
Uncategorized
15p
11.1%
32
Diagnostic Test '16 Level 2 P3 - Remove Cancer
Uncategorized
3
51.2%
115
PEG-O-Stripes
Uncategorized
15
28.2%
9
«
1
2
...
35
36
37
38
39
40
...
99
100
»