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
5
6
...
67
68
»
Problem search
Full text search
Show problem types
Category
All
---
ACM-ICPC
APIO
Balkan OI
Baltic OI
BlueBook
Brazil OI
Bubble Cup
Bulgarian OI
CCC
CCO
CEOI
Classics
COCI
CSPC
CTF
Data Structure Tests
DMOPC
DWITE
ECOO
FHC
Fun Math
GCJ
GFSSOC
IOI
JOI
Mock CCC
MWC
NOI
Olympiads School
POI
Seasonal
SIUCF
TLE
TSOC
Uncategorized
VM7WC
Woburn Challenge
Point range
Go
Random
Hot problems
Deque
DMPG '18 G1 - Musical Chairs
WC '18 Contest 4 S1 - World of StarCraft
CCC '20 S2 - Escape Room
WC '18 Contest 1 S2 - Essay Generator
CCC '14 S3 - The Geneva Confection
CCC '12 S2 - Aromatic Numbers
Problem
Category
Points
AC % ▾
Users
COCI '19 Contest 2 #4 Popcount
COCI
20p
100.0%
1
COCI '19 Contest 2 #1 ACM
COCI
7p
100.0%
2
COCI '17 Contest 1 #6 Plahte
COCI
20
100.0%
1
WC '17 Contest 4 S4 - Alpha Nerd (Hard)
Uncategorized
25p
100.0%
1
ICPC SWERC 2017 F - Shattered Cake
ACM-ICPC
5
93.5%
13
DMOJ Capture The Flag '20 R1 - Classic Java
CTF
5
92.3%
23
CTU Open Contest 2018 - Escalators
ACM-ICPC
15
90.0%
2
COCI '18 Contest 6 #1 Lun
COCI
5p
90.0%
9
COCI '20 Contest 1 #2 Bajka
COCI
7p
90.0%
7
DWITE '08 R3 #5 - Now in 3D
DWITE
7
87.5%
7
WC '01 P1 - The Rock
Woburn Challenge
7
87.5%
16
COCI '18 Contest 6 #2 Konj
COCI
7p
85.7%
5
NOI '99 P5 - Optimally Connected Subset
NOI
15p
84.2%
16
COCI '18 Contest 5 #1 Titlovi
COCI
5
83.3%
3
DMOJ Capture The Flag '20 C3 - Small AES
CTF
7
82.6%
19
ECOO '12 R3 P4 - Splitsville
ECOO
10p
80.0%
2
COCI '15 Contest 7 #4 Optor
COCI
12
80.0%
4
DWITE '09 R3 #5 - Up To Four Colours
DWITE
12
79.2%
30
DWITE '09 R3 #3 - Binary Test Strings 2
DWITE
5
78.9%
13
WC '17 Finals S1 - An Interspecific Army
Woburn Challenge
10p
78.9%
86
COCI '19 Contest 5 #5 Zapina
COCI
12p
77.3%
23
COCI '19 Contest 5 #1 Emacs
COCI
5p
75.0%
17
COCI '15 Contest 7 #3 Ozljeda
COCI
10
75.0%
5
DMOJ Capture The Flag '20 R2 - EZ Assembly
CTF
7
75.0%
17
DWITE '08 R4 #1 - Four player Pong with no players
DWITE
7
74.9%
37
PIB '20 P1 - Marcus and Head Bonks
Uncategorized
3p
74.6%
209
WC '17 Contest 1 J1 - Canadian Accent
Woburn Challenge
3
74.5%
220
Ulam Spiral
Uncategorized
7p
74.2%
19
Vera and Outfits
ACM-ICPC
3
74.1%
353
COCI '09 Contest 4 #1 Autori
COCI
3
73.7%
231
DWITE '07 R4 #3 - Don't follow my links
DWITE
5
73.5%
7
WC '17 Contest 4 J1 - Fight or Flight
Woburn Challenge
3
73.1%
128
Homie from Suomi
Uncategorized
5
72.9%
8
Lift Control
Uncategorized
25p
72.9%
3
DWITE '07 R5 #3 - Parity bit
DWITE
5
72.8%
57
DWITE '09 R5 #3 - Summary Diff
DWITE
5
72.7%
6
WC '18 Contest 3 J3 - R
Woburn Challenge
5p
72.5%
37
DWITE '10 R1 #5 - Ricochet Robot
DWITE
7
72.2%
11
COCI '15 Contest 4 #3 Deathstar
COCI
7p
71.8%
138
COCI '09 Contest 6 #1 Kajak
COCI
5
71.6%
47
Traffic Lights
Uncategorized
15p
71.6%
27
DWITE '09 R3 #4 - Spiral Out
DWITE
7
71.4%
5
WC '17 Contest 2 J1 - The Rings of Power
Woburn Challenge
3
71.4%
125
ECOO '16 R3 P4 - Cuthbert's Calculator
ECOO
12p
70.7%
4
WC '18 Contest 2 J2 - This Message will Self-Destruct
Woburn Challenge
3p
70.6%
84
CTU Open Contest 2018 - Horsemeet
ACM-ICPC
10
70.6%
7
DMOJ Capture The Flag '20 R4 - Python Cycles
CTF
12
70.6%
12
DMOPC '19 Contest 6 P0 - Trivial Math
DMOPC
3
70.6%
426
DMOPC '19 Contest 5 P0 - Concurrent Competitor Counting
DMOPC
3
70.3%
284
DWITE '09 R4 #5 - Ice Maze
DWITE
10
70.2%
18
«
1
2
3
4
5
6
...
67
68
»