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
...
14
15
16
17
18
19
...
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
ECOO '16 R1 P1 - Pass or Fail
ECOO
5p
26.2%
301
COCI '13 Contest 1 #1 Trener
COCI
5p
50.4%
120
COCI '13 Contest 1 #2 Kušač
COCI
5p
36.7%
237
MWC '15 #4 P3: Salt
MWC
5p
28.0%
120
MWC '15 #4 P2: Data Formatting
MWC
5
51.7%
54
MWC '15 #5 P2: WildCard
MWC
5p
17.7%
27
MWC '15 #5 P1: Stats
MWC
5
15.0%
45
MWC '15 #5 P3: French Words
MWC
5p
30.3%
120
MWC '15 #7 P2: Thief in the Night
MWC
5p
38.3%
187
DMPG '16 B5 - Bank Burning
DMOPC
5p
12.1%
52
DMPG '16 B3 - CCO
DMOPC
5
41.8%
102
Richmond Green P1 - HSIUNG
Uncategorized
5p
35.9%
147
Favorite Numbers
Uncategorized
5
26.0%
119
Back To School '16: Paradox
Seasonal
5
33.7%
286
CCCHK '15 J2 - What is the minimum area?
CCC
5
35.7%
267
CCCHK '15 J3 - Queens can't attack me!
CCC
5
51.1%
613
CCCHK '15 J4 - Where to build my house?
CCC
5
18.0%
270
CCC '96 S3 - Pattern Generator
CCC
5
11.0%
356
CCC '98 S2 - Cross Number Puzzle
CCC
5
43.1%
495
CCC '01 S1 - Keeping Score
CCC
5
32.7%
1504
CCC '01 S2 - Spirals
CCC
5
41.2%
912
CCC '97 S1 - Sentences
CCC
5
29.4%
1021
CCC '97 S2 - Nasty Numbers
CCC
5
46.0%
797
CCC '97 S3 - Double Knockout Competition
CCC
5
10.3%
171
CCC '97 S4 - Dynamic Dictionary Coding
CCC
5
11.8%
221
CCC '99 S1 - Card Game
CCC
5
31.3%
1001
CCC '00 J1 - Calendar
CCC
5
11.2%
1359
CCC '00 S1 - Slot Machines
CCC
5
27.3%
4529
COCI '15 Contest 1 #1 Karte
COCI
5
61.6%
107
COCI '15 Contest 1 #2 Akcija
COCI
5
41.3%
84
TLE '16 Contest 1 P2 - Heavy-Light Decomposition
TLE
5p
22.1%
73
COCI '15 Contest 2 #1 Marko
COCI
5
48.3%
367
COCI '15 Contest 3 #2 Esej
COCI
5
12.3%
38
COCI '15 Contest 3 #1 Pot
COCI
5
68.1%
208
ICPC NAQ 2016 K - Robotopia
ICPC
5
18.4%
24
TLE '16 Contest 2 P2 - Packing Microwaves
TLE
5p
16.9%
104
COCI '06 Contest 1 #2 Herman
COCI
5
42.2%
657
TLE '16 Contest 3 P2 - In Remembrance
TLE
5p
13.1%
67
COCI '06 Contest 1 #3 Okviri
COCI
5
41.6%
335
COCI '06 Contest 3 #1 Patuljci
COCI
5
60.0%
593
Hungry
Uncategorized
5p
43.9%
112
COCI '06 Contest 3 #2 N-puzzle
COCI
5
45.7%
408
ICPC NAQ 2015 F - Quick Brown Fox
ICPC
5
41.6%
137
GFSSOC '17 J3 - AIF Essay
GFSSOC
5
25.2%
74
COCI '06 Contest 4 #3 Prsteni
COCI
5
58.0%
224
COCI '06 Contest 5 #2 Natrij
COCI
5
35.1%
254
TLE '16 Contest 4 P1 - Stack of Presents
TLE
5p
32.4%
399
HCI '16 - Cheese
Uncategorized
5p
38.7%
22
HCI '16 - Ulam Spiral
Uncategorized
5p
17.0%
34
HCI '16 - Unexpected Factorial
Uncategorized
5p
28.3%
85
«
1
2
...
14
15
16
17
18
19
...
99
100
»