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
...
47
48
49
50
51
52
...
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 ▾
IOI '13 P3 - Wombats (Standard I/O)
IOI
40p
9.5%
60
DMOPC '20 Contest 3 P3 - A Ring of Buckets
DMOPC
12p
7.0%
60
COCI '10 Contest 3 #1 Tablica
COCI
3p
47.2%
60
Max's Anger Contest Series 2 P5 - Job Anger
Seasonal
12p
28.2%
60
COCI '23 Contest 2 #1 Pahuljice
COCI
5p
43.2%
60
Mine and Tree
Seasonal
30p
22.7%
59
COCI '14 Contest 7 #2 Kriza
COCI
7p
18.2%
59
VM7WC '16 #6 Silver - Diana Socializes
VM7WC
7
17.1%
59
MWC '15 #2 P3: Breaking Ice
MWC
5
34.3%
59
MWC '15 #6 P2: Breadwinners
MWC
7p
27.1%
59
IOI '15 P6 - Towns
IOI
40p
15.5%
59
New Year's '17 P2 - Peter's Escape
Seasonal
10p
12.7%
59
COCI '07 Contest 2 #5 Kemija
COCI
15p
21.8%
59
COCI '07 Regional #4 Jednakost
COCI
12p
13.9%
59
DWITE '10 R1 #2 - Robot Vacuum Prototype
DWITE
3
38.5%
59
APIO '14 P1 - Palindromes
APIO
25p
18.2%
59
Mock CCC '18 Contest 3 J5/S3 - A Cookie-Cutter Problem
Mock CCC
10p
10.0%
59
CCO '18 P6 - Flop Sorting
CCO
30p
17.4%
59
COCI '19 Contest 4 #5 Nivelle
COCI
12p
44.4%
59
NOI '97 P2 - Optimal Routing
China NOI
7p
28.5%
59
NOI '00 P1 - Ceramic Necklace
China NOI
5
32.1%
59
NOI '05 P4 - CongCong and KoKo
China NOI
15p
19.9%
59
King Graff's Defense
Uncategorized
15p
8.5%
59
A Digit Problem
Uncategorized
12p
31.8%
59
COCI '16 Contest 3 #2 Pohlepko
COCI
7p
22.2%
59
Carnival Game
Uncategorized
7
28.3%
59
MCIPC Contest 2 P2 - Icicles
Uncategorized
3
39.1%
59
COCI '22 Contest 4 #5 Vrsta
COCI
12p
35.8%
59
CCO Preparation Test 3 P3 - Arrow
Mock CCO
30p
17.7%
58
DMPG '15 G5 - ExpedColle
DMOPC
15p
10.6%
58
IOI '98 P1 - Contact
IOI
10p
8.9%
58
ECOO '17 R1 P4 - Almost Sorted
ECOO
7p
9.0%
58
COCI '08 Contest 1 #3 Mravojed
COCI
10
14.9%
58
DWITE '08 R4 #1 - Four player Pong with no players
DWITE
7
71.9%
58
TLE '17 Contest 8 P1 - Artificial Intelligence
TLE
7p
9.1%
58
Another Contest 1 Problem 3 - Poutine
ACC
10
4.1%
58
CCO '00 P4 - Packet Routing
CCO
7
59.8%
58
COCI '19 Contest 3 #1 Preokret
COCI
5p
17.8%
58
William and Summation
Uncategorized
7p
27.1%
58
COCI '21 Contest 6 #1 Med
COCI
5p
40.1%
58
A Math Contest P11 - Weak Goldbach's Conjecture
Uncategorized
15
23.9%
58
DMOPC '22 Contest 3 P3 - Ina's Takodachis
DMOPC
15p
5.7%
58
EGOI '22 P1 - SubsetMex
EGOI
10p
36.8%
58
Max's Anger Contest Series 1 P5 - Slacking Subsequences
Seasonal
15p
30.9%
58
Find Dates
Uncategorized
7
8.5%
57
DMPG '16 G4 - Araxxi
DMOPC
15p
20.8%
57
ECOO '17 R2 P2 - Treasure Hunt
ECOO
10p
41.7%
57
RTE '16 J3 - Mule Wars
Uncategorized
5p
36.0%
57
IOI '17 P4 - The Big Prize
IOI
20p
10.5%
57
DWITE '09 R4 #3 - Moving at the same time
DWITE
5
31.1%
57
«
1
2
...
47
48
49
50
51
52
...
99
100
»