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
CEOI '16 P2 - Kangaroo
DWITE '10 R3 #3 - Dominos Tiling
COCI '08 Contest 3 #6 Najkraci
APIO '10 P1 - Commando
CCC '24 J3 - Bronze Count
CCC '24 S4 - Painting Roads
CCC '23 J3 - Special Event
Problem
Category
Points
AC %
Users ▴
CCC '07 S4 - Waterpark
CCC
7
30.9%
1502
CCC '01 S1 - Keeping Score
CCC
5
32.7%
1504
CCC '11 J4 - Boring Business
CCC
7
27.8%
1508
CCC '22 S2 - Good Groups
CCC
5p
26.1%
1561
CCC '08 S3 - Maze
CCC
7
29.3%
1563
CCC '17 J4 - Favourite Times
CCC
5p
23.4%
1571
CCC '10 S2 - Huffman Encoding
CCC
5
53.6%
1576
CCC '09 J2 - Old Fishin' Hole
CCC
5
39.1%
1588
CCC '03 J2 - Picture Perfect
CCC
3p
23.9%
1614
CCC '18 J5 - Choose your own path
CCC
7p
24.1%
1614
CCC '23 J2 - Chili Peppers
CCC
3p
53.5%
1633
CCC '16 J4 - Arrival Time
CCC
5
29.1%
1682
CCC '05 S2 - Mouse Move
CCC
5
37.3%
1685
CCC '20 S2 - Escape Room
CCC
10p
12.8%
1695
CCC '07 S3 - Friends
CCC
7
37.5%
1703
CCC '04 J4 - Simple Encryption
CCC
5
51.0%
1711
CCC '12 S2 - Aromatic Numbers
CCC
5
53.4%
1717
CCC '23 S1 - Trianglane
CCC
5p
31.9%
1719
CCC '17 S3 - Nailed It!
CCC
7p
30.5%
1720
CCC '23 J1 - Deliv-e-droid
CCC
3p
55.4%
1733
CCC '15 S3 - Gates
CCC
10p
18.7%
1778
CCC '12 S5 - Mouse Journey
CCC
7
45.6%
1818
CCC '12 S3 - Absolutely Acidic
CCC
7
26.6%
1862
CCC '11 J2 - Who Has Seen The Wind
CCC
5
25.7%
1866
CCC '02 S2 - Fraction Action
CCC
5
19.0%
1884
CCC '96 S1 - Deficient, Perfect, and Abundant
CCC
5
32.3%
1894
CCC '03 S3 - Floor Plan
CCC
7
27.8%
1954
CCC '15 S2 - Jerseys
CCC
5p
26.7%
1957
CCC '00 J2 - 9966
CCC
3
35.8%
1959
CCC '09 S1 - Cool Numbers
CCC
5
22.8%
2027
CCC '20 S1 - Surmising a Sprinter's Speed
CCC
5p
42.8%
2047
CCC '10 J2 - Up and Down
CCC
5
21.8%
2052
CCC '13 S2 - Bridge Transport
CCC
5
26.7%
2058
CCC '07 J4 - Anagram Checker
CCC
5
37.2%
2130
CCC '22 S1 - Good Fours and Good Fives
CCC
5p
39.4%
2132
CCC '08 S1 - It's Cold Here!
CCC
5
37.5%
2181
CCC '12 S1 - Don't pass me the ball!
CCC
3
56.4%
2240
CCC '21 S2 - Modern Art
CCC
7p
29.0%
2253
CCC '15 J3 - Rövarspråket
CCC
5p
38.5%
2269
CCC '05 S1 - Snow Calls
CCC
5
43.3%
2278
CCC '07 J2 - I Speak TXTMSG
CCC
3
21.7%
2290
CCC '20 J4 - Cyclic Shifts
CCC
5p
45.7%
2291
CCC '16 S1 - Ragaman
CCC
3p
29.7%
2304
CCC '00 S4 - Golf
CCC
7
24.5%
2308
CCC '03 J1 - Trident
CCC
3
28.6%
2325
CCC '07 S1 - Federal Voting Age
CCC
3
36.2%
2329
CCC '19 S2 - Pretty Average Primes
CCC
5p
25.9%
2358
CCC '05 J3 - Returning Home
CCC
5
37.2%
2364
CCC '20 J3 - Art
CCC
3p
42.9%
2367
CCC '17 J3 - Exactly Electrical
CCC
3p
29.9%
2372
«
1
2
3
4
5
6
»