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
...
64
65
66
67
68
69
...
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
DWITE '10 R3 #3 - Dominos Tiling
A Math Contest P5 - Good Arrays
Counting Subsequences
CCC '24 J3 - Bronze Count
WC '96 P6 - Bases Multiplication
Problem
Category
Points
AC % ▴
Users
CCO '04 P5 - Jengaism
CCO
7
31.8%
116
DMOPC '21 Contest 1 P2 - Folding Clothes
DMOPC
7p
31.9%
188
Miniature Sudoku
Uncategorized
7
31.9%
20
DWITE '12 R2 #2 - Word Arithmetic
DWITE
5
31.9%
19
Educational DP Contest AtCoder Y - Grid 2
Uncategorized
17
31.9%
103
TLE '17 Contest 6 P6 - 6 Friends
TLE
15p
31.9%
16
NOIP '04 P2 - Combine Fruit
China NOI
5
31.9%
44
IOI '96 P4 - Sorting a Three-Valued Sequence
IOI
10
31.9%
142
PIB '20 P2 - 2 + 2 = 5
Uncategorized
5p
31.9%
100
COCI '10 Contest 7 #4 Poštar
COCI
12p
32.0%
55
Jack Needs Help
Uncategorized
10p
32.0%
20
Baltic OI '07 P5 - Connected Points
Baltic OI
15p
32.0%
7
CCC '23 S1 - Trianglane
CCC
5p
32.0%
1721
IOI '98 P6 - Polygon
IOI
15
32.0%
61
WC '96 P3 - Hidden Geography
Woburn Challenge
5
32.0%
121
Cheerio Contest 1 S2 - School Expansion
Uncategorized
7p
32.0%
128
WOSS Dual Olympiad 2023 Team Round P1: Combining Candy Canes
Uncategorized
5
32.0%
47
VM7WC '16 #1 Bronze - A New Prime Factorization
VM7WC
5
32.1%
390
DMOPC '14 Contest 4 P1 - New Key
DMOPC
3p
32.1%
209
CCO '07 P1 - Cows
CCO
10
32.1%
186
Baltic OI '16 P4 - Cities
Baltic OI
15p
32.1%
25
TLE '16 Contest 8 P1 - Paper Hole Punching
TLE
3p
32.1%
157
NOI '00 P1 - Ceramic Necklace
China NOI
5
32.1%
59
A Math Contest P1 - Arrays
Uncategorized
5
32.1%
249
WC '18 Contest 3 J4 - Leveling Up
Woburn Challenge
7p
32.1%
84
Educational DP Contest AtCoder S - Digit Sum
Uncategorized
12
32.1%
119
DMOPC '21 Contest 5 P2 - Permutations & Primes
DMOPC
7
32.2%
313
COCI '11 Contest 1 #2 Matrix
COCI
7p
32.2%
27
New Year's '15 P4 - Leftover Eggnog
Seasonal
15p
32.2%
128
WC '16 Finals S2 - Rational Recipes
Woburn Challenge
7p
32.2%
33
Koala Ball
Uncategorized
12p
32.2%
14
Riolku's Mock CCC S1 - Word Bot
Mock CCC
3p
32.2%
426
ICPC NEERC 2014 K - Knockout Racing
ICPC
7
32.3%
9
APIO '07 P3 - Zoo
APIO
20p
32.3%
60
CCC '96 S1 - Deficient, Perfect, and Abundant
CCC
5
32.3%
1894
VM7WC '16 #6 Bronze - The Most Important Skill in Biology
VM7WC
3
32.3%
253
Fast Bit Duplication
Uncategorized
10
32.3%
48
UTS Open '18 P2 - ABCs
Uncategorized
3p
32.3%
275
NOI '97 P1 - Competition Ranking
China NOI
7
32.3%
38
SAC '22 Code Challenge 2 P1 - Calendar Management
SAC Coding Challenge
5
32.3%
94
IOI '09 P2 - Hiring
IOI
12p
32.3%
252
Equivalent Addresses
Uncategorized
7
32.3%
19
UTS Open '21 P1 - COVID Party
Uncategorized
5p
32.3%
269
GFSSOC '15 Fall J5 - Nightmare-a-thon
GFSSOC
10p
32.3%
548
COCI '18 Contest 3 #3 Sajam
COCI
15p
32.4%
7
Canada Day Contest 2021 - Starfall
Seasonal
15
32.4%
112
ICPC NEERC 2018 J - JS Minification
ICPC
20
32.4%
4
DMOPC '21 Contest 4 P4 - Christmas Graph
DMOPC
17p
32.4%
40
TLE '16 Contest 4 P1 - Stack of Presents
TLE
5p
32.4%
399
Champion Contest
Uncategorized
7
32.4%
175
«
1
2
...
64
65
66
67
68
69
...
99
100
»