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
3
4
5
6
»
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 '21 J3 - Secret Instructions
Problem
Category ▾
Points
AC %
Users
CCC '19 S5 - Triangle: The Data Structure
CCC
20p
17.9%
358
CCC '19 S4 - Tourism
CCC
20p
7.7%
248
CCC '19 S3 - Arithmetic Square
CCC
12p
13.6%
501
CCC '19 S1 - Flipper
CCC
3p
46.0%
3955
CCC '19 J1 - Winning Score
CCC
3
50.8%
7014
CCC '19 J2 - Time to Decompress
CCC
3
52.4%
3328
CCC '19 J3 - Cold Compress
CCC
5
46.2%
3160
CCC '19 S2 - Pretty Average Primes
CCC
5p
25.9%
2358
CCC '19 J5 - Rule of Three
CCC
20p
0.7%
7
CCC '20 J4 - Cyclic Shifts (Hard)
CCC
12p
3.8%
36
CCC '20 J1 - Dog Treats
CCC
3
56.1%
4017
CCC '20 J2 - Epidemiology
CCC
3
27.1%
3707
CCC '20 J3 - Art
CCC
3p
42.9%
2367
CCC '20 J4 - Cyclic Shifts
CCC
5p
45.7%
2291
CCC '20 S1 - Surmising a Sprinter's Speed
CCC
5p
42.8%
2047
CCC '20 S2 - Escape Room
CCC
10p
12.8%
1695
CCC '20 S3 - Searching for Strings
CCC
12p
8.9%
842
CCC '20 S4 - Swapping Seats
CCC
12p
25.6%
490
CCC '20 S5 - Josh's Double Bacon Deluxe
CCC
17p
29.6%
258
CCC '20 S2 - Escape Room (Hard)
CCC
15p
5.6%
55
CCCHK '15 S1 - Finding number of pairs
CCC
7p
13.7%
142
CCCHK '15 S2 - Matching Problem
CCC
10p
4.9%
14
CCCHK '15 S3 - Symmetric Cross
CCC
12p
16.2%
20
CCCHK '15 S4 - When to meet?
CCC
15p
20.0%
8
CCCHK '15 S5 - Can I pass the courses?
CCC
25p
5.0%
6
CCC '06 J5 - CCC Othello
CCC
10p
36.0%
228
CCC '02 S4 - Bridge Crossing (Hard)
CCC
20
8.5%
32
CCC '00 S5 - Sheep and Coyotes (Hard)
CCC
20
5.6%
21
CCC '21 J1 - Boiling Water
CCC
3p
53.7%
3166
CCC '21 J2 - Silent Auction
CCC
3p
51.2%
2759
CCC '21 J3 - Secret Instructions
CCC
5p
36.1%
2533
CCC '21 J4 - Arranging Books
CCC
7p
19.6%
1324
CCC '21 S1 - Crazy Fencing
CCC
5p
47.7%
2559
CCC '21 S2 - Modern Art
CCC
7p
28.9%
2252
CCC '21 S3 - Lunch Concert
CCC
10p
24.6%
1018
CCC '21 S4 - Daily Commute
CCC
12p
26.0%
585
CCC '21 S5 - Math Homework
CCC
15p
24.5%
418
CCC '22 S1 - Good Fours and Good Fives
CCC
5p
39.4%
2131
CCC '22 S2 - Good Groups
CCC
5p
26.1%
1561
CCC '22 S3 - Good Samples
CCC
10p
18.3%
656
CCC '22 S4 - Good Triplets
CCC
15p
28.5%
310
CCC '22 S5 - Good Influencers
CCC
17p
32.6%
186
CCC '22 J1 - Cupcake Party
CCC
3
55.3%
2928
CCC '22 J2 - Fergusonball Ratings
CCC
3
47.5%
2682
CCC '22 J3 - Harp Tuning
CCC
5p
33.2%
1497
CCC '22 J5 - Square Pool
CCC
10p
20.5%
463
CCC '23 S1 - Trianglane
CCC
5p
32.0%
1718
CCC '23 S2 - Symmetric Mountains
CCC
7p
26.5%
814
CCC '23 S3 - Palindromic Poster
CCC
10p
15.4%
420
CCC '23 S4 - Minimum Cost Roads
CCC
15p
19.6%
256
«
1
2
3
4
5
6
»