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
Educational DP Contest AtCoder I - Coins
Educational DP Contest AtCoder K - Stones
DMOPC '20 Contest 4 P1 - Missing Numbers
CCC '12 S3 - Absolutely Acidic
CCC '21 J3 - Secret Instructions
DWITE '07 R3 #4 - The Convex Fence Company
CCC '24 J5 - Harvest Waterloo
Problem
Category
Points
AC %
▴
Users
CCC '02 S1 - The Students' Council Breakfast
CCC
5
39.5%
1495
CCC '02 S2 - Fraction Action
CCC
5
19.0%
1881
CCC '07 S2 - Boxes
CCC
5
27.5%
1210
CCC '07 S3 - Friends
CCC
7
37.5%
1698
CCC '07 S4 - Waterpark
CCC
7
30.9%
1499
CCC '01 J1 - Dressing Up
CCC
3
48.2%
2871
CCC '01 J2 - Mod Inverse
CCC
3
42.9%
2526
CCOQR '16 - Stupendous Bowties
CCC
10p
31.8%
247
CCOQR '16 - Through A Maze Darkly
CCC
20p
18.4%
104
CCOQR '16 - Data Structure
CCC
15p
22.1%
177
CCCHK '15 J1 - Rock-paper-scissors
CCC
3
51.8%
852
CCCHK '15 J2 - What is the minimum area?
CCC
5
35.6%
266
CCCHK '15 J3 - Queens can't attack me!
CCC
5
50.6%
612
CCCHK '15 J4 - Where to build my house?
CCC
5
17.5%
247
CCCHK '15 J5 - No friends in the same group.
CCC
15p
9.8%
33
CCC '05 S3 - Quantum Operations
CCC
10p
34.8%
439
CCC '05 S4 - Pyramid Message Scheme
CCC
10
35.7%
817
CCC '01 S4 - Cookies
CCC
10
19.2%
417
CCC '05 J4 - Cross Spiral
CCC
7p
32.6%
577
CCC '01 S5 - Post's Correspondence Problem
CCC
10
28.9%
315
CCC '96 S2 - Divisibility by 11
CCC
7
6.8%
179
CCC '96 S5 - Maximum Distance
CCC
7
25.4%
417
CCC '96 S3 - Pattern Generator
CCC
5
10.9%
351
CCC '98 S2 - Cross Number Puzzle
CCC
5
43.1%
495
CCC '01 S3 - Strategic Bombing
CCC
7
38.7%
1456
CCC '01 S1 - Keeping Score
CCC
5
32.7%
1502
CCC '01 S2 - Spirals
CCC
5
41.2%
912
CCC '02 S3 - Blindfold
CCC
15
6.1%
150
CCC '02 S4 - Bridge Crossing
CCC
10p
37.2%
884
CCC '02 S5 - Follow the Bouncing Ball
CCC
10
13.8%
190
CCC '00 S4 - Golf
CCC
7
24.4%
2302
CCC '98 S3 - Mars Rover
CCC
7p
16.5%
161
CCC '98 S4 - Lottery
CCC
10
9.6%
92
CCC '98 S5 - Mountain Passage
CCC
10
13.0%
148
CCC '97 S1 - Sentences
CCC
5
29.4%
1019
CCC '97 S2 - Nasty Numbers
CCC
5
45.9%
794
CCC '97 S3 - Double Knockout Competition
CCC
5
10.0%
158
CCC '97 S4 - Dynamic Dictionary Coding
CCC
5
11.8%
221
CCC '97 S5 - Long Division
CCC
10
9.9%
65
CCC '99 S1 - Card Game
CCC
5
31.3%
998
CCC '99 S2 - Year 2000
CCC
7
14.6%
105
CCC '99 S3 - Divided Fractals
CCC
7
16.5%
68
CCC '99 S4 - A Knightly Pursuit
CCC
12
18.7%
348
CCC '99 S5 - Letter Arithmetic
CCC
12
16.0%
77
CCC '00 J1 - Calendar
CCC
5
11.2%
1352
CCC '00 J2 - 9966
CCC
3
35.8%
1953
CCC '00 S1 - Slot Machines
CCC
5
27.3%
4513
CCC '00 S2 - Babbling Brooks
CCC
7
34.1%
2531
CCC '00 S5 - Sheep and Coyotes
CCC
10p
4.1%
176
CCC '00 S3 - Surfing
CCC
7
17.5%
620
«
1
2
3
4
5
6
»