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
...
44
45
46
47
48
49
...
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
CCC '24 J3 - Bronze Count
CCC '00 S1 - Slot Machines
CCC '19 S2 - Pretty Average Primes
Problem
Category
Points ▾
AC %
Users
DMOPC '21 Contest 7 P3 - Whack-an-Ishigami
DMOPC
12p
15.5%
82
Another Contest 9 Problem 3 - Sun & Moon
ACC
12
22.5%
32
BPC 1 S2 - Train Commute
Uncategorized
12p
6.6%
47
DMOPC '21 Contest 9 P3 - Terrible Trains
DMOPC
12p
21.6%
82
Baltic OI '03 P2 - Gems
Baltic OI
12p
46.9%
14
Baltic OI '03 P4 - The Gangs
Baltic OI
12p
41.2%
43
CCO '22 P1 - Alternating Heights
CCO
12p
27.6%
138
NOIP '99 P3 - Traveller's Budget
China NOI
12p
11.4%
13
NOIP '99 P1 - Missile Interception
China NOI
12p
39.8%
40
NOIP '99 P4 - Stamp Face Value Design
China NOI
12p
10.5%
9
A Math Contest P10 - Tricky Multisets
Uncategorized
12
25.7%
48
A Math Contest P8 - Permutation Counting
Uncategorized
12
35.9%
61
DMOPC '21 Contest 10 P3 - Peculiar Reflections
DMOPC
12p
14.2%
75
A Math Contest P9 - Buy Some Get Some
Uncategorized
12
27.1%
55
Yet Another Contest 6 P4 - No More Nails!
YAC
12p
11.3%
53
NOIP '20 P2 - String Matching
China NOI
12p
13.5%
10
Another Contest 9 Problem 5 - Satellite
ACC
12
16.7%
17
Yet Another Contest 4 P3 - Canadian Cactus Competition
YAC
12p
10.2%
52
DMOPC '22 Contest 1 P3 - Group Project
DMOPC
12p
14.0%
95
Baltic OI '02 P1 - Speed Limits
Baltic OI
12p
26.3%
16
Baltic OI '02 P2 - Tennis Club
Baltic OI
12p
34.0%
13
Baltic OI '02 P3 - Triangles
Baltic OI
12p
18.0%
8
Baltic OI '02 P4 - Bicriterial Routing
Baltic OI
12
40.9%
8
NOIP '18 Junior P3 - Shuttle Bus
China NOI
12p
16.3%
6
JOI '22 Final P2 - Self Study
JOI
12p
25.7%
16
An Animal Contest 7 P3 - Squirrel Scramble
AAC
12p
14.9%
67
Yet Another Contest 5 P3 - Potted Plants
YAC
12p
15.9%
65
DMOPC '22 Contest 2 P3 - Good Permutations
DMOPC
12p
20.0%
122
Yet Another Contest 7 P3 - No More Math Homework
YAC
12p
16.2%
89
DMOPC '22 Contest 1 P4 - Card Game
DMOPC
12p
15.9%
63
MCIPC Contest 2 P6 - Block Tower
Uncategorized
12p
11.6%
9
Waterloo 2022 Fall E - Water Flow
Waterloo Local
12
18.3%
7
Max's Anger Contest Series 1 P4 - Greedily Gamboling
Seasonal
12p
17.8%
73
COCI '22 Contest 1 #4 Iksevi
COCI
12p
28.3%
28
COCI '22 Contest 2 #4 Prijateljice
COCI
12p
24.2%
39
WOSS Dual Olympiad 2022 S3: Sightseeing in the North Pole
Seasonal
12
16.9%
23
EGOI '21 P2 - Luna Likes Love
EGOI
12p
26.0%
43
Mock CCC '23 Contest 1 J5 - Calculus Problem
Mock CCC
12p
10.1%
41
Cheerio Contest 3 P3 - Everything Array
Uncategorized
12p
5.4%
75
Cheerio Contest 3 P4 - Bit Flips
Uncategorized
12
36.3%
81
COCI '22 Contest 3 #4 Bomboni
COCI
12p
15.3%
61
Waterloo 2023 Winter B - Laser Trap
Waterloo Local
12
22.2%
13
COCI '22 Contest 4 #5 Vrsta
COCI
12p
35.8%
59
Max's Anger Contest Series 2 P4 - Number Anger
Seasonal
12p
37.7%
51
Max's Anger Contest Series 2 P5 - Job Anger
Seasonal
12p
27.3%
60
Google Code Jam '22 Qualification Round Problem D - Chain Reactions
Google Code Jam
12p
52.0%
8
COCI '22 Contest 5 #2 Diskurs
COCI
12p
39.9%
71
COCI '22 Contest 5 #3 Logaritam
COCI
12p
46.9%
49
Google Code Jam '22 Round 2 Problem A - Spiraling Into Control
Google Code Jam
12p
50.0%
7
Google Code Jam '09 Round 1A Problem A - Multi-base happiness
Google Code Jam
12p
40.0%
3
«
1
2
...
44
45
46
47
48
49
...
99
100
»