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
»
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 '24 J4 - Troublesome Keys
COCI '22 Contest 4 #1 7Krokods
CCC '24 S2 - Heavy-Light Composition
CCC '19 J3 - Cold Compress
CCC '24 J5 - Harvest Waterloo
COCI '23 Contest 5 #1 Zlagalica
CCC '24 S3 - Swipe
Problem
Category
Points
AC %
Users
CCO '08 P3 - Mobile
CCO
17p
31.3%
46
CCO '08 P4 - Herding
CCO
10p
31.3%
220
CCO '08 P5 - Candy
CCO
7p
18.3%
234
CCO '08 P6 - Landing
CCO
45
20.0%
38
CCO '09 P1 - Invasion of the Boxes
CCO
20p
12.8%
22
CCO '09 P2 - Dinner
CCO
20p
9.8%
50
CCO '09 P3 - Beware the Geoducks
CCO
10
9.8%
34
CCO '09 P4 - Bottle Caps
CCO
20p
14.0%
36
CCO '09 P5 - Parade
CCO
17p
17.3%
43
CCO '09 P6 - A Weighty Problem
CCO
12p
15.9%
73
CCO '10 P1 - Barking Dogs!
CCO
10
33.9%
232
CCO '10 P2 - Tree Pruning
CCO
15
29.6%
184
CCO '10 P3 - Wowow
CCO
15p
24.3%
279
CCO '10 P4 - Computer Purchase Return
CCO
10
39.0%
359
CCO '10 P5 - Space Miner
CCO
15
31.5%
52
CCO '10 P6 - Shuffle
CCO
10
35.4%
150
CCO '11 P1 - Putnam
CCO
7
27.6%
108
CCO '11 P2 - Vampire Tunnels
CCO
15p
18.8%
315
CCO '11 P3 - Spies Like Us
CCO
10p
22.8%
202
CCO '11 P4 - Reorganization
CCO
7p
35.1%
215
CCO '11 P5 - Fixing Disks
CCO
40p
7.7%
6
CCO '11 P6 - Biggest (Zero Carbon) Footprint
CCO
15p
12.6%
78
CCO '12 P1 - Choose Your Own Arithmetic
CCO
7
22.8%
223
CCO '12 P2 - The Hungary Games
CCO
15
24.4%
472
CCO '12 P3 - Mhocskian Languages
CCO
20p
49.6%
103
CCO '12 P4 - Editor Distance
CCO
10
33.6%
143
CCO '12 P5 - Sample Size
CCO
7
24.1%
171
CCO '12 P6 - The Winds Of War
CCO
12p
40.1%
67
CCO '13 P1 - All Your Base Belong to Palindromes
CCO
10p
18.6%
208
CCO '13 P2 - Tourney
CCO
12p
42.3%
378
CCO '13 P3 - LHC
CCO
12p
23.1%
396
CCO '13 P4 - A Romantic Movie Outing
CCO
20p
23.9%
91
CCO '13 P5 - Transforming Comets
CCO
15p
19.3%
74
CCO '13 P6 - Repetitivity
CCO
25p
42.0%
197
CCO '14 P1 - Troyangles
CCO
10p
37.6%
593
CCO '14 P2 - King Gruff
CCO
15p
36.2%
250
CCO '14 P3 - Werewolf
CCO
17p
42.2%
193
CCO '14 P4 - Where's That Fuel?
CCO
7p
34.3%
384
CCO '14 P5 - Early Exam Evacuation
CCO
20p
23.2%
86
CCO '14 P6 - Gates
CCO
40p
9.0%
13
CCO '15 P1 - Hungry Fox
CCO
15p
21.3%
218
CCO '15 P2 - Artskjid
CCO
15p
15.3%
501
CCO '15 P3 - Solar Flight
CCO
20p
12.7%
66
CCO '15 P4 - Cars on Ice
CCO
10p
18.9%
205
CCO '15 P5 - Timpanist
CCO
20p
36.3%
101
CCO '15 P6 - Eggscavation
CCO
30p
18.5%
69
CCO '16 P1 - Field Trip
CCO
10p
21.8%
171
CCO '16 P2 - Splitting Hares
CCO
15p
14.2%
89
CCO '16 P3 - Legends
CCO
30p
9.8%
60
CCO '16 P4 - O Canada
CCO
10p
36.3%
261
«
1
2
3
4
»