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
...
36
37
38
39
40
41
...
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
COCI '14 Contest 6 #4 Kratki
ACSL '09 Practice P4 - Rank
IOI '00 P1 - Palindrome
CCC '17 S3 - Nailed It!
COCI '10 Contest 2 #2 Napor
DMOPC '14 Contest 4 P3 - Golden Lily
DMOPC '17 Contest 4 P4 - Cops and Robbers
Problem
Category
Points
AC % ▴
Users
Singularity Cup P6 - Explosive Breakout
Uncategorized
30p
19.7%
15
CCC '07 J5 - Keep on Truckin'
CCC
7
19.7%
1069
Baltic OI '18 P1 - Love Polygon
Baltic OI
20p
19.7%
40
DMOPC '21 Contest 8 P1 - Peanut Planning
DMOPC
7p
19.7%
212
APIO '16 P1 - Boat
APIO
20p
19.7%
51
DMOPC '20 Contest 6 P4 - Land of the Carrot Trees II
DMOPC
17p
19.7%
36
DWITE '08 R4 #5 - Blow your mind with 4th D
DWITE
7
19.7%
13
Fibonacci Sequence (Harder)
Uncategorized
17
19.7%
300
CCC '04 S4 - Space Turtle
CCC
10p
19.7%
185
COCI '19 Contest 4 #2 Spiderman
COCI
7p
19.7%
51
DMOPC '19 Contest 5 P5 - Crazy Cyclic Coincidences
DMOPC
17p
19.7%
43
COCI '08 Contest 5 #4 Lubenica
COCI
12p
19.7%
54
Back To School '17: Wet Mud
Seasonal
10p
19.7%
329
An Animal Contest 2 P4 - Koala Gambling
AAC
12
19.7%
196
ICPC ECNA 2016 B - Foosball Dynasty
ICPC
10
19.7%
12
DMOPC '16 Contest 4 P6 - Molly and Flying Drones
DMOPC
15p
19.8%
150
Baltic OI '14 P6 - Senior Postmen
Baltic OI
15p
19.8%
14
DMOPC '20 Contest 4 P3 - Roving Roombas
DMOPC
12p
19.8%
181
DMOPC '17 Contest 5 P2 - Mimi and Binary
DMOPC
5p
19.8%
260
Wesley's Anger Contest 6 Problem 8 - Crystal Disco
WAC
30p
19.8%
9
WOSS Dual Olympiad 2022 S2: Festive Card Game
Seasonal
7p
19.8%
62
Rectangle Counting
Uncategorized
17p
19.8%
64
BSSPC '21 S1 - Lakshy and Palindromic Rectangle
Uncategorized
5p
19.8%
184
RGPC '17 P3 - Intercept
Uncategorized
7
19.8%
43
CEOI '17 P4 - Building Bridges
CEOI
20p
19.8%
98
CCC '23 S4 - Minimum Cost Roads
CCC
15p
19.8%
254
TLE '16 Contest 7 P4 - Abstract Problem
TLE
10p
19.8%
152
WC '18 Finals S3 - Screen Time
Woburn Challenge
15p
19.8%
23
DWITE '09 R1 #5 - Running In Circles
DWITE
7
19.8%
316
ECOO '19 R2 P3 - Ribbon
ECOO
15p
19.8%
13
GFSSOC '15 Winter S3 - PalinDrone
GFSSOC
7p
19.9%
208
DMOPC '20 Contest 4 P4 - Javelin Throwing
DMOPC
15p
19.9%
55
Next Prime
Classics
5
19.9%
2180
Mock CCC '18 Contest 1 S4 - A Graph Problem
Mock CCC
12p
19.9%
97
CEOI '16 P4 - Match
CEOI
15p
19.9%
22
DMPG '19 B6 - Oddity
DMOPC
10
19.9%
55
Back To School '17: Hot and Cold
Seasonal
20p
19.9%
66
2-Dimensional Range Minimum Query
Classics
17p
19.9%
133
DMOPC '21 Contest 9 P4 - Ace of Diamonds
DMOPC
20p
20.0%
43
GlobeX Cup '18 S2 - Test Scores
Uncategorized
7p
20.0%
111
DMOPC '19 Contest 4 P3 - Taking Cues
DMOPC
12p
20.0%
77
Yet Another Contest 7 P1 - Page Turning
YAC
5p
20.0%
276
GFSSOC '15 Winter J3 - Christmas Presents
GFSSOC
5p
20.0%
62
ECOO '15 R3 P2 - Tiling Trouble
ECOO
15p
20.0%
2
Google Kickstart '17 Round C Problem C - Magical Thinking
Google Kick Start
10p
20.0%
10
ICPC PACNW 2016 G - Maximum Islands
ICPC
15
20.0%
5
COCI '19 Contest 5 #3 Matching
COCI
35p
20.0%
5
ICPC NEERC 2010 B - Binary Operation
ICPC
20p
20.0%
3
CCCHK '15 S4 - When to meet?
CCC
15p
20.0%
8
Another Contest 7 Problem 4 - Team Assignments
ACC
12p
20.0%
31
«
1
2
...
36
37
38
39
40
41
...
99
100
»