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
...
46
47
48
49
50
51
...
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
CCCHK '15 J4 - Where to build my house?
CCC '24 S2 - Heavy-Light Composition
Yet Another Contest 8 P2 - No More Modern Art
2spooky4me
Yet Another Contest 8 P1 - Permutation Sorting
Problem
Category
Points
AC %
Users ▾
GFSSOC '15 Winter J3 - Christmas Presents
GFSSOC
5p
20.0%
62
DMOPC '15 Contest 7 P5 - Ariadne's Thread
DMOPC
17p
21.0%
62
CCO '16 P3 - Legends
CCO
30p
9.8%
62
MNYC '17: Bells
Seasonal
17p
19.0%
62
DWITE '09 R1 #1 - iProfits
DWITE
3
49.3%
62
DWITE '08 R2 #1 - My shiny digital key
DWITE
3
38.8%
62
Summer Institute '17 Contest 1 P5 - Crazy Math
SIUCF
15
27.8%
62
Mock CCC '19 Contest 2 S3 - Tudor Tallies Triangular Totals
Mock CCC
10p
5.4%
62
GlobeX Cup '19 J4 - Winni's Lonely Card Game
Uncategorized
5p
18.5%
62
Art Academy VII: A Mysterious Object
Uncategorized
12p
41.3%
62
Revenge of the Digger
Uncategorized
20p
32.8%
62
WC '02 P2 - Cow-bot
Woburn Challenge
10
21.9%
62
WC '02 P1 - A Planning Session
Woburn Challenge
5
16.7%
62
COCI '16 Contest 5 #1 Tuna
COCI
3p
67.7%
62
COCI '12 Contest 2 #1 Mortadela
COCI
3p
69.6%
62
Prefix Digits
Uncategorized
7
15.1%
62
NOIP '21 P2 - Sequence
China NOI
20p
28.7%
62
GFSS Christmas Challenge P4 - Coal Counting
GFSSOC
7p
26.6%
62
Yet Another Contest 2 P3 - Maximum Damage
YAC
10p
7.9%
62
Comparing Arrays
Uncategorized
15p
16.9%
62
A Math Contest P8 - Permutation Counting
Uncategorized
12
36.6%
62
WOSS Dual Olympiad 2022 S2: Festive Card Game
Seasonal
7p
19.8%
62
DMOPC '14 Exam Time P6 - Math Homework
DMOPC
15p
24.3%
61
ICPC ECNA 2016 C - The Key to Cryptography
ICPC
7
46.4%
61
TLE '16 Contest 4 P3 - Cubes
TLE
7p
25.7%
61
MNYC '17: ASCII Art II
Seasonal
5
42.3%
61
TLE '16 Contest 8 P4 - Delivery Service
TLE
17p
9.4%
61
COCI '07 Contest 5 #6 Baza
COCI
25
7.6%
61
COCI '08 Contest 1 #5 Skakavac
COCI
20p
10.3%
61
Back From Summer '19 P3: ASDFGHJKL
Seasonal
10p
8.7%
61
Mock CCC '20 Contest 2 S4 - Rotational Arrays
Mock CCC
10p
11.8%
61
NOI '14 P2 - Enchanted Forest
China NOI
20p
9.6%
61
IOI '98 P6 - Polygon
IOI
15
32.0%
61
CCO '03 P1 - BFed
CCO
10
25.4%
61
Appleby Contest '20 P5 - Ridiculous Tree
Uncategorized
15p
22.4%
61
Canada Day Contest 2021 - 0-1
Seasonal
20p
48.7%
61
An Animal Contest 2 P6 - Koala Transport System
AAC
17p
22.2%
61
MALD Contest 1 P3 - Scratch Cat and Infestation
Uncategorized
7
13.0%
61
Another Contest 9 Problem 2 - Counting Down the Days
ACC
7
6.9%
61
COCI '22 Contest 3 #4 Bomboni
COCI
12p
15.3%
61
UTS Open '15 #5 - Distribution Channel
Uncategorized
20p
6.0%
60
ICPC NAQ 2016 D - Brackets
ICPC
15
15.9%
60
HCI '16 - Foodie
Uncategorized
7p
31.7%
60
Mock CCO '17 Problem 1 - Fast Fuhrer Transform
Mock CCO
10p
25.4%
60
DMOPC '18 Contest 6 P5 - Quadrat Sampling
DMOPC
20p
15.2%
60
APIO '07 P3 - Zoo
APIO
20p
32.3%
60
OCC '19 S1 - Floor Planning
Uncategorized
3p
32.6%
60
CCO '20 P5 - Interval Collection
CCO
25p
16.0%
60
NOI '12 P1 - Random Number Generator
China NOI
15p
24.8%
60
Skyscrapers
Uncategorized
15p
18.3%
60
«
1
2
...
46
47
48
49
50
51
...
99
100
»