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
...
23
24
25
26
27
28
...
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
IOI '94 P1 - The Triangle
IOI '14 P3 - Game
Longest Increasing Subsequence
CCC '24 J4 - Troublesome Keys
CCC '24 J3 - Bronze Count
COCI '22 Contest 1 #5 Neboderi
CCC '11 S1 - English or French?
Problem
Category
Points
AC % ▾
Users
COCI '11 Contest 3 #2 D'hondt
COCI
5p
38.3%
12
Willie's Fan Club
Uncategorized
7
38.3%
41
Inaho X
Uncategorized
7p
38.2%
11
Pulse
Uncategorized
3
38.2%
375
WOSS Dual Olympiad 2023 J3/S1: Moving Sand
Uncategorized
7
38.2%
114
CCC '23 J3 - Special Event
CCC
5p
38.2%
1264
CEOI '18 P4 - Fibonacci Representations
CEOI
40p
38.2%
8
COCI '10 Contest 1 #2 Profesor
COCI
5p
38.1%
74
Hardcore Grinding
Uncategorized
5
38.1%
467
DWITE '09 R1 #4 - My First True Letter
DWITE
3
38.1%
104
DWITE '08 R2 #3 - My drink is made of cubes
DWITE
5
38.1%
21
Wesley's Anger Contest 3 Bonus Problem - Game of Death
WAC
7p
38.1%
13
WC '01 P8 - Time to Get Medieval
Woburn Challenge
10
38.1%
39
DMOJ Capture The Flag '20 F4 - Wire on Shark
CTF
10
38.1%
7
COCI '12 Contest 2 #6 Inspektor
COCI
25p
38.1%
4
COCI '17 Contest 6 #4 Cover
COCI
15
38.1%
39
WC '17 Contest 1 J4 - Canuck Detection
Woburn Challenge
5p
38.1%
119
DWITE '06 R5 #3 - UPC Check Digit
DWITE
5
38.0%
100
CCCHK '08 J1 - Best fish
CCC
3
38.0%
801
MWC '15 #7 P2: Thief in the Night
MWC
5p
38.0%
184
GlobeX Cup '18 J Sample - Farming Simulator
Uncategorized
5p
38.0%
133
COCI '17 Contest 1 #2 Tetris
COCI
5
38.0%
27
MWC '15 #4 P4: Dealing with Knots
MWC
7
37.9%
257
DWITE '08 R4 #3 - Secret party
DWITE
7
37.9%
54
COCI '15 Contest 7 #2 Prozor
COCI
7p
37.9%
21
Google Code Jam '12 Qualification Round Problem A - Speaking in Tongues
Google Code Jam
3p
37.9%
9
COCI '16 Contest 6 #3 Turnir
COCI
7
37.9%
47
GFSSOC '15 Fall Practice P1 - Bruno and Trig
GFSSOC
3p
37.8%
439
CTU Open Contest 2017 - Pond Cascade
ICPC
7
37.8%
6
Baltic OI '06 P1 - Bitwise Expressions
Baltic OI
15p
37.8%
9
TSOC '15 Contest 1 #1 - Molecular or Non-Molecular?
TSOC
3p
37.8%
180
COCI '18 Contest 5 #2 Jarvis
COCI
5p
37.8%
138
Baltic OI '01 P6 - Teleports
Baltic OI
10p
37.8%
24
COCI '06 Regional #3 Firefly
COCI
10
37.8%
205
CCO '14 P1 - Troyangles
CCO
10p
37.8%
619
VM7WC '16 #3 Silver - Can Shahir even get there?!
VM7WC
5
37.8%
1434
Waterloo 2017 Winter E - Vera and Love Triangles
Waterloo Local
25
37.8%
11
WOSS Dual Olympiad 2022 J2: Counting Christmas Trees
Seasonal
3
37.8%
200
BlueBook - Leap Year
BlueBook
3
37.8%
833
CTU Open Contest 2018 - Security Guards
ICPC
10
37.8%
31
MCIPC Contest 1 P1 - Cypher
Uncategorized
5p
37.7%
48
Baltic OI '11 P4 - Treasures and Vikings
Baltic OI
15p
37.7%
18
Baltic OI '11 P7 - Polygon
Baltic OI
17p
37.7%
9
LKP '18 Contest 2 P1 - Food Lines
Uncategorized
3
37.7%
1009
DWITE '10 R1 #2 - Robot Vacuum Prototype
DWITE
3
37.7%
57
IOI '02 P4 - Batch Scheduling
IOI
20p
37.7%
318
DWITE '10 R2 #4 - Fractions to Decimal
DWITE
7
37.7%
18
COCI '20 Contest 4 #5 Patkice II
COCI
15p
37.7%
35
Max's Anger Contest Series 2 P4 - Number Anger
Seasonal
12p
37.7%
51
Polynomial Time Boolean Satisfiability
Uncategorized
15p
37.7%
48
«
1
2
...
23
24
25
26
27
28
...
99
100
»