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
...
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
DWITE '10 R3 #3 - Dominos Tiling
COCI '08 Contest 3 #6 Najkraci
WC '01 P3 - Back to the Future
A Math Contest P5 - Good Arrays
GFSSOC '15 Winter S1 - OR-deal
Counting Subsequences
CCC '11 S1 - English or French?
Problem
Category
Points
AC %
▴
Users
Matrix Determinant
Uncategorized
15p
10.5%
50
Longest Common Subsequence
Classics
7
40.6%
838
Single Source Shortest Path
Classics
7
41.6%
1141
Modular Multiplicative Inverse
Classics
7
25.7%
235
CCC '03 J1 - Trident
CCC
3
28.6%
2327
CCC '03 J2 - Picture Perfect
CCC
3p
23.9%
1614
CCC '03 S1 - Snakes and Ladders
CCC
5
20.5%
3108
CCC '03 S2 - Poetry
CCC
5
17.3%
1456
CCC '03 S3 - Floor Plan
CCC
7
27.8%
1956
CCC '03 S5 - Trucking Troubles
CCC
10p
17.6%
684
CCC '02 J1 - 0123456789
CCC
3
5.4%
724
CCC '02 J2 - AmeriCanadian
CCC
3
25.1%
3890
STNBD P1 - Ren Ashbell
Uncategorized
3p
29.3%
945
STNBD P2 - Claire Elstein
Uncategorized
12p
22.9%
230
STNBD P3 - Rinslet Laurenfrost
Uncategorized
5p
29.7%
133
STNBD P4 - Ellis Fahrengart
Uncategorized
17p
15.3%
136
STNBD P5 - Fianna Ray Ordesia
Uncategorized
10p
12.0%
26
STNBD P6 - Terminus Est
Uncategorized
35p
11.9%
54
CCC '02 S1 - The Students' Council Breakfast
CCC
5
39.6%
1499
CCC '02 S2 - Fraction Action
CCC
5
19.0%
1885
CCC '07 S2 - Boxes
CCC
5
27.5%
1214
CCC '07 S3 - Friends
CCC
7
37.5%
1703
CCC '07 S4 - Waterpark
CCC
7
30.9%
1502
TSOC '15 Contest 1 #1 - Molecular or Non-Molecular?
TSOC
3p
38.0%
182
TSOC '15 Contest 1 #4 - Restaurant Of Secrets
TSOC
5p
27.7%
45
Rolling Encryption
Uncategorized
10
20.5%
97
Mailing Origami
Uncategorized
20
9.1%
67
Line Sweep
Uncategorized
25
9.8%
29
Tree Cutting
Seasonal
12p
35.0%
141
Mine and Tree
Seasonal
30p
22.7%
59
Is it a Tree?
Seasonal
7p
33.4%
737
New Year's '15 P6 - Tiles
Seasonal
20p
23.8%
26
New Year's '15 P4 - Leftover Eggnog
Seasonal
15p
32.2%
128
The Cosmic Era P5 - GENESIS
Uncategorized
20
34.3%
122
New Year's '15 P5 - Message to Mars
Seasonal
20p
14.4%
52
New Year's '15 P1 - Invitation Devastation
Seasonal
3
42.9%
356
New Year's '15 P2 - Food Selection
Seasonal
5p
36.2%
109
New Year's '15 P3 - Gift Wrap
Seasonal
5
61.3%
152
VM7WC '15 #1 Gold - JHK
VM7WC
10
28.7%
127
VM7WC '15 #1 Silver - Jung Goon
VM7WC
5
45.0%
215
VM7WC '15 #1 Bronze - Goon
VM7WC
3
38.4%
533
VM7WC '15 #2 Bronze - Recruits!
VM7WC
3
28.0%
344
VM7WC '15 #2 Gold - Uniting the Earth Empire
VM7WC
12
20.3%
303
VM7WC '15 #2 Silver - 4 Nations, 1 Secret
VM7WC
10
22.1%
202
VM7WC '15 #3 Bronze - M's Theorem!
VM7WC
5
21.2%
70
VM7WC '15 #3 Silver - Test Scores
VM7WC
5
30.9%
374
VM7WC '15 #3 Gold - Pollos
VM7WC
12
15.9%
48
TSOC '15 Contest 1 #2 - Special Store
TSOC
7p
10.4%
25
VM7WC '15 #4 Bronze - Melanie's Cradles
VM7WC
3
41.4%
135
VM7WC '15 #4 Gold - Chain Rule
VM7WC
10
36.0%
373
«
1
2
3
4
5
6
...
99
100
»