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
...
50
51
52
53
54
55
...
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 '08 Contest 3 #6 Najkraci
APIO '10 P1 - Commando
CCC '24 J5 - Harvest Waterloo
TSS Club Fair 2017 Problem B
CCC '24 J4 - Troublesome Keys
CCC '04 S2 - TopYodeller
DWITE '10 R3 #3 - Dominos Tiling
Problem
Category
Points ▴
AC %
Users
DMOPC '21 Contest 3 P2 - Weak Data
DMOPC
10p
11.9%
160
UCRPC F21 D - Stake Your Claim
ICPC
10
54.9%
37
UCRPC F21 G - Snack Attack
ICPC
10p
17.9%
21
An Animal Contest 4 P2 - Lavish Lights
AAC
10
14.4%
210
COCI '21 Contest 1 #2 Kamenčići
COCI
10p
30.6%
66
An Animal Contest 4 P3 - Snowy Slopes
AAC
10
20.6%
135
NOIP '18 P2 - Currency System
China NOI
10p
42.8%
114
NOIP '18 P4 - Travel
China NOI
10p
17.7%
17
SAC '22 Code Challenge 5 P4 - Querying Intervals
SAC Coding Challenge
10p
35.9%
118
Baltic OI '09 P4 - Rectangle
Baltic OI
10p
12.1%
18
NOIP '21 P1 - Saying Numbers
China NOI
10p
31.0%
110
COCI '21 Contest 2 #2 Kutije
COCI
10p
44.2%
86
WOSS Dual Olympiad 2021 S3: Late for Class!
Seasonal
10p
26.8%
67
An Animal Contest 5 P3 - Ski Resort
AAC
10
12.5%
163
COCI '21 Contest 3 #2 Cijanobakterije
COCI
10p
41.1%
78
SAC '22 Code Challenge 3 Junior P5 - Normal Encoding
SAC Coding Challenge
10p
17.8%
33
Mock CCC '22 2 S2 - Kaguya Wants to Grow the Student Council
Mock CCC
10p
35.2%
105
Yet Another Contest 1 P2 - A Boring Problem
YAC
10p
12.9%
86
Yet Another Contest 1 P3 - Fluke
YAC
10p
16.4%
97
Mock CCC '22 Contest 2 J5 - Dominating the Olympics
Mock CCC
10
16.0%
76
An Animal Contest 5 P2 (Hard Version) - Permutations & Primes
AAC
10
12.1%
51
COCI '21 Contest 4 #2 Autobus
COCI
10p
18.6%
73
CCC '22 S3 - Good Samples
CCC
10p
18.3%
656
CCC '22 J5 - Square Pool
CCC
10p
20.5%
464
Yet Another Contest 2 P3 - Maximum Damage
YAC
10p
7.9%
62
SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
SAC Coding Challenge
10
24.6%
38
COCI '21 Contest 5 #2 Dijamant
COCI
10p
26.8%
26
COI '10 #1 Sort
COCI
10p
19.6%
14
COI '10 #3 Rijeka
COCI
10p
34.3%
20
COI '12 #4 Spijuni
COCI
10p
30.4%
24
BPC 1 J4 - Assignment of the Year
Uncategorized
10p
10.0%
46
Yet Another Contest 3 P2 - Work Experience
YAC
10p
21.9%
70
BPC 1 J5 - Set
Uncategorized
10
28.6%
21
Cheerio Contest 1 S4 - Mystery Boxes
Uncategorized
10p
17.1%
40
COCI '21 Contest 6 #2 Zemljište
COCI
10p
8.7%
34
COCI '21 Contest 6 #3 Naboj
COCI
10p
36.0%
113
Least Multiple
Olympiads School
10p
8.1%
32
DMOPC '21 Contest 8 P2 - Kanna Market
DMOPC
10p
21.8%
136
Cheerio Contest 1 J5 - Arithmetic Sequence
Uncategorized
10p
5.6%
22
Distinct Shapes
Uncategorized
10
22.1%
37
NOI '22 Multi-Provincial Team Selection P1 - Preprocessor
China NOI
10p
8.2%
12
SAC '22 Code Challenge 5 Junior P5 - English Summative
SAC Coding Challenge
10p
26.5%
79
Guess the Wordle
Uncategorized
10
18.1%
5
Baltic OI '03 P1 - Barrel
Baltic OI
10p
9.4%
5
Lemon
Uncategorized
10
33.5%
15
A Math Contest P7 - Factors
Uncategorized
10
29.3%
132
Rule of Lemons
Uncategorized
10
16.7%
5
A Math Contest P6 - Global Maximum
Uncategorized
10
28.6%
75
NOIP '20 P1 - Drainage System
China NOI
10p
10.6%
20
Building
Uncategorized
10p
24.5%
49
«
1
2
...
50
51
52
53
54
55
...
99
100
»