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
CCC '24 S2 - Heavy-Light Composition
Max's Anger Contest Series 2 P2 - Password Anger
SAC '22 Code Challenge 5 P2 - Querying Extensions
The Cosmic Era P2 - Uneven Sand
Max's Anger Contest Series 2 P3 - Array Anger
CCC '13 J4 - Time on task
CCC '20 J4 - Cyclic Shifts
Problem
Category
Points
AC %
Users ▾
CCC '07 J4 - Anagram Checker
CCC
5
37.2%
2126
CCC '13 S2 - Bridge Transport
CCC
5
26.7%
2056
CCC '10 J2 - Up and Down
CCC
5
21.8%
2050
CCC '20 S1 - Surmising a Sprinter's Speed
CCC
5p
42.8%
2047
CCC '09 S1 - Cool Numbers
CCC
5
22.8%
2026
CCC '15 S2 - Jerseys
CCC
5p
26.7%
1957
CCC '00 J2 - 9966
CCC
3
35.8%
1955
CCC '03 S3 - Floor Plan
CCC
7
27.8%
1952
CCC '96 S1 - Deficient, Perfect, and Abundant
CCC
5
32.3%
1894
CCC '02 S2 - Fraction Action
CCC
5
19.0%
1884
Python Infinite Loop
Uncategorized
7p
17.3%
1878
CCC '11 J2 - Who Has Seen The Wind
CCC
5
25.7%
1862
CCC '12 S3 - Absolutely Acidic
CCC
7
26.6%
1858
CCC '12 S5 - Mouse Journey
CCC
7
45.6%
1818
DMOPC '14 Contest 2 P4 - Deforestation
DMOPC
5p
32.5%
1794
CCC '15 S3 - Gates
CCC
10p
18.7%
1778
CCC '23 J1 - Deliv-e-droid
CCC
3p
55.5%
1729
CCC '17 S3 - Nailed It!
CCC
7p
30.5%
1719
CCC '23 S1 - Trianglane
CCC
5p
32.0%
1718
CCC '12 S2 - Aromatic Numbers
CCC
5
53.3%
1713
CCC '04 J4 - Simple Encryption
CCC
5
51.0%
1710
CCC '07 S3 - Friends
CCC
7
37.5%
1701
3n+1
Uncategorized
3
39.3%
1698
CCC '20 S2 - Escape Room
CCC
10p
12.8%
1692
CCC '05 S2 - Mouse Move
CCC
5
37.3%
1685
CCC '16 J4 - Arrival Time
CCC
5
29.0%
1681
List Minimum (Hard)
Uncategorized
5
35.9%
1665
CCC '23 J2 - Chili Peppers
CCC
3p
53.5%
1631
Another Contest 6 Problem 9 - Obligatory Wood IV Problem
ACC
0p
100.0%
1615
CCC '03 J2 - Picture Perfect
CCC
3p
23.9%
1614
CCC '18 J5 - Choose your own path
CCC
7p
24.1%
1613
COCI '18 Contest 3 #1 Magnus
COCI
5
33.5%
1596
CCC '09 J2 - Old Fishin' Hole
CCC
5
39.1%
1587
CCC '10 S2 - Huffman Encoding
CCC
5
53.6%
1576
CCC '17 J4 - Favourite Times
CCC
5p
23.4%
1570
Triple Fat Ladies
Uncategorized
5
28.6%
1567
CCC '08 S3 - Maze
CCC
7
29.3%
1563
CCC '22 S2 - Good Groups
CCC
5p
26.1%
1560
CCC '11 J4 - Boring Business
CCC
7
27.8%
1508
CCC '01 S1 - Keeping Score
CCC
5
32.7%
1504
CCC '07 S4 - Waterpark
CCC
7
30.9%
1501
CCC '02 S1 - The Students' Council Breakfast
CCC
5
39.6%
1497
CCC '22 J3 - Harp Tuning
CCC
5p
33.2%
1493
IOI '94 P1 - The Triangle
IOI
7p
56.5%
1481
BlueBook - Times Tables
BlueBook
3
54.3%
1481
CCC '98 S1 - Censor
CCC
5
37.5%
1476
CCC '05 J5 - Bananas
CCC
10
21.6%
1468
CCC '06 J3 - Cell-Phone Messaging
CCC
3
41.3%
1465
CCC '15 J5 - π-day
CCC
10p
27.5%
1464
CCC '01 S3 - Strategic Bombing
CCC
7
38.7%
1458
«
1
2
3
4
5
6
...
99
100
»