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
7
8
9
»
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 '13 Contest 5 #6 Ladice
CCC '11 J2 - Who Has Seen The Wind
APIO '12 P1 - Dispatching
CCC '09 J2 - Old Fishin' Hole
CCC '16 S3 - Phonomenal Reviews
CCC '00 S2 - Babbling Brooks
CCC '21 J4 - Arranging Books
Problem
Category
Points
AC %
Users
CCC '21 S5 - Math Homework
CCC
15p
25.3%
452
CCC '22 J1 - Cupcake Party
CCC
3
55.6%
3210
CCC '22 J2 - Fergusonball Ratings
CCC
3
47.3%
2896
CCC '22 J3 - Harp Tuning
CCC
5p
33.1%
1628
CCC '22 J5 - Square Pool
CCC
10p
20.6%
520
CCC '22 S1 - Good Fours and Good Fives
CCC
5p
39.5%
2242
CCC '22 S2 - Good Groups
CCC
5p
26.2%
1666
CCC '22 S3 - Good Samples
CCC
10p
18.2%
704
CCC '22 S4 - Good Triplets
CCC
15p
28.4%
337
CCC '22 S5 - Good Influencers
CCC
17p
32.2%
208
CCC '23 J1 - Deliv-e-droid
CCC
3p
55.4%
2055
CCC '23 J2 - Chili Peppers
CCC
3p
52.6%
1913
CCC '23 J3 - Special Event
CCC
5p
37.7%
1491
CCC '23 J5 - CCC Word Hunt
CCC
10p
24.7%
592
CCC '23 S1 - Trianglane
CCC
5p
31.8%
1894
CCC '23 S2 - Symmetric Mountains
CCC
7p
26.7%
904
CCC '23 S3 - Palindromic Poster
CCC
10p
15.5%
464
CCC '23 S4 - Minimum Cost Roads
CCC
15p
19.4%
285
CCC '23 S5 - The Filter
CCC
20p
15.9%
97
CCC '24 J1 - Conveyor Belt Sushi
CCC
3p
68.1%
1199
CCC '24 J2 - Dusa And The Yobis
CCC
3p
57.5%
915
CCC '24 J3 - Bronze Count
CCC
5p
39.6%
812
CCC '24 J4 - Troublesome Keys
CCC
5p
18.5%
446
CCC '24 J5 - Harvest Waterloo
CCC
7p
36.0%
493
CCC '24 S1 - Hat Circle
CCC
3p
63.7%
794
CCC '24 S2 - Heavy-Light Composition
CCC
5p
51.7%
704
CCC '24 S3 - Swipe
CCC
10p
16.3%
273
CCC '24 S4 - Painting Roads
CCC
12p
34.2%
222
CCC '24 S5 - Chocolate Bar Partition
CCC
20p
9.8%
32
CCC '96 S1 - Deficient, Perfect, and Abundant
CCC
5
32.4%
1954
CCC '96 S2 - Divisibility by 11
CCC
7
6.8%
199
CCC '96 S3 - Pattern Generator
CCC
5
11.4%
384
CCC '96 S4 - When in Rome
CCC
10
33.1%
581
CCC '96 S5 - Maximum Distance
CCC
7
25.4%
436
CCC '97 S1 - Sentences
CCC
5
29.7%
1061
CCC '97 S2 - Nasty Numbers
CCC
5
46.3%
819
CCC '97 S3 - Double Knockout Competition
CCC
5
10.9%
184
CCC '97 S4 - Dynamic Dictionary Coding
CCC
5
12.1%
240
CCC '97 S5 - Long Division
CCC
10
10.5%
73
CCC '98 S1 - Censor
CCC
5
37.5%
1535
CCC '98 S2 - Cross Number Puzzle
CCC
5
43.1%
510
CCC '98 S3 - Mars Rover
CCC
7p
16.8%
169
CCC '98 S4 - Lottery
CCC
10
9.8%
98
CCC '98 S5 - Mountain Passage
CCC
10
13.3%
157
CCC '99 S1 - Card Game
CCC
5
31.3%
1077
CCC '99 S2 - Year 2000
CCC
7
14.6%
110
CCC '99 S3 - Divided Fractals
CCC
7
16.5%
74
CCC '99 S4 - A Knightly Pursuit
CCC
12
18.5%
366
CCC '99 S5 - Letter Arithmetic
CCC
12
16.8%
81
CCCJQR P1
Seasonal
0
72.1%
663
«
1
2
3
4
5
6
7
8
9
»