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
...
71
72
73
74
75
76
...
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 '19 S2 - Pretty Average Primes
CCC '00 S1 - Slot Machines
Problem
Category
Points ▴
AC %
Users
COCI '13 Contest 6 #5 Hash
COCI
15p
14.5%
14
COCI '11 Contest 4 #6 Kriptogram
COCI
15p
27.3%
4
Segment Tree Practice 3
Uncategorized
15
48.2%
34
COCI '12 Contest 2 #5 Informacije
COCI
15p
25.6%
9
COCI '12 Contest 6 #5 Jedan
COCI
15
36.4%
28
COCI '12 Contest 6 #6 Bakterije
COCI
15
7.7%
3
COCI '12 Contest 4 #5 Dlakavac
COCI
15p
53.3%
7
COCI '17 Contest 5 #4 Karte
COCI
15p
50.0%
15
COCI '17 Contest 6 #4 Cover
COCI
15
38.1%
39
COCI '12 Contest 3 #6 Procesor
COCI
15p
50.0%
1
COCI '20 Contest 4 #5 Patkice II
COCI
15p
37.0%
36
COCI '17 Contest 7 #3 Go
COCI
15p
22.7%
13
COCI '17 Contest 7 #5 Dostavljač
COCI
15
35.8%
20
COCI '12 Contest 5 #5 Rotiraj
COCI
15p
24.6%
11
DMOPC '20 Contest 5 P3 - Bottom Row
DMOPC
15p
6.7%
41
Fast Search
Uncategorized
15p
26.6%
104
COCI '20 Contest 6 #5 Index
COCI
15p
49.7%
104
Canada Day Contest 2021 - Starfall
Seasonal
15
32.4%
112
An Animal Contest 2 P5 - Koala Carnival
AAC
15p
34.7%
97
DMOPC '20 Contest 5 P4 - Slacking Off
DMOPC
15p
13.5%
82
CPC '21 Contest 1 P5 - AQT and Modern Art
Uncategorized
15p
15.8%
45
COI '20 #1 Autobahn
COCI
15p
11.4%
28
Baltic OI '13 P1 - Ball Machine
Baltic OI
15p
23.4%
14
Calendar Contest Problem 5 — Reign of Terror
Uncategorized
15
3.3%
2
SAC '22 Code Challenge 3 P4 - Finding Friends
SAC Coding Challenge
15p
23.8%
64
Spring Coding Bowl '22 P4 - Circle Game
Uncategorized
15p
6.7%
10
Cute String Merging
Uncategorized
15p
35.1%
30
Spring Coding Bowl '22 P5 - Temple Placement
Uncategorized
15p
13.8%
7
ICPC NEERC 2014 I - Improvements
ICPC
15
25.0%
3
ICPC NWERC 2015 E - Elementary Math
ICPC
15
41.2%
4
Dynamic Sum
Uncategorized
15
14.6%
16
Another Contest 8 Problem 4 - Up and Down
ACC
15
11.4%
46
Another Contest 8 Problem 5 - U-Turn Finesse
ACC
15
18.9%
81
Fixing Shirts
Uncategorized
15
18.4%
24
DMOPC '21 Contest 2 P4 - Water Mechanics
DMOPC
15p
23.4%
56
UCRPC F21 I - Sphere Mongers
ICPC
15p
5.8%
6
DMOPC '21 Contest 3 P3 - Hopping Frogs
DMOPC
15p
21.9%
53
SAC '22 Code Challenge 5 P5 - Querying Rectangles
SAC Coding Challenge
15p
15.7%
36
Baltic OI '09 P1 - Beetle
Baltic OI
15
34.4%
39
MALD Contest 1 P4 - Scratch Cat and Demolition
Uncategorized
15p
33.6%
51
COCI '21 Contest 3 #4 Ekoeko
COCI
15p
32.8%
41
An Animal Contest 5 P5 - Counting Rectangles
AAC
15p
12.3%
50
Liars
Uncategorized
15p
15.8%
9
COI '18 #2 Ljepotica
COCI
15p
26.7%
7
Baltic OI '07 P5 - Connected Points
Baltic OI
15p
32.0%
7
Mock CCC '22 2 S4 - Kaguya Wants to Build a Great Wall
Mock CCC
15p
7.5%
8
Baltic OI '08 P2 - Gates
Baltic OI
15p
16.7%
1
Baltic OI '10 P1 - BEARs
Baltic OI
15
30.4%
5
The Contest Contest 1 P3 - A Typical WAC Problem
Uncategorized
15p
17.4%
47
Baltic OI '10 P6 - Mines
Baltic OI
15p
9.1%
1
«
1
2
...
71
72
73
74
75
76
...
99
100
»