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
...
95
96
97
98
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 '23 J3 - Special Event
CCC '24 S2 - Heavy-Light Composition
Max's Anger Contest Series 2 P3 - Array Anger
COCI '11 Contest 5 #2 Eko
APIO '09 P3 - The Great ATM Robbery
CCO '07 P2 - Snowflakes
CCC '19 S2 - Pretty Average Primes
Problem
Category
Points
AC %
Users ▾
Google Code Jam '22 Round 3 Problem C - Mascot Maze
Google Code Jam
17p
66.7%
3
Waterloo 2013 Fall B - Java vs. Scheme Smackdown
Waterloo Local
7
17.6%
3
Waterloo 2001 Fall 1 E - A Multiplication Game
Waterloo Local
7
16.1%
3
NOI '17 P3 - Pool
China NOI
30p
38.9%
3
NOI '23 P6 - Merge the Books
China NOI
30p
16.7%
3
IOI '23 P4 - Beech Tree
IOI
35p
4.9%
3
Triangles
Uncategorized
30p
23.8%
3
Valentine's Day '15 P1 - #1 BABE
Seasonal
15p
3.6%
2
CCO Preparation Test 5 P4 - Toys
Mock CCO
15p
3.1%
2
DMPG '16 G5 - Continuation Passing
DMOPC
20p
7.1%
2
ICPC NAQ 2016 I - Primonimo
ICPC
20p
40.0%
2
TLE '16 Contest 4 P6 - Essay Writing
TLE
25p
1.0%
2
ICPC ECNA 2000 C - Rational Approximation
ICPC
17
28.6%
2
Bubble Cup V9 B Underfail
Bubble Cup
20
5.0%
2
ECOO '15 R3 P2 - Tiling Trouble
ECOO
15p
20.0%
2
ECOO '15 R3 P4 - Under the Rug
ECOO
12p
17.6%
2
ECOO '12 R3 P4 - Splitsville
ECOO
10p
66.7%
2
Maximum Product of K Integers
Uncategorized
25
3.2%
2
TLE 2018-19 P4 - Fax McClad and the Melee
Seasonal
20p
0.1%
2
Brandon's Cryptographically Secure Pseudorandom Number Generator
Uncategorized
30p
0.8%
2
CCO '97 P3 - Porous Stone
CCO
10
33.3%
2
CCO '98 P3 - Bus Schedule
CCO
12
12.5%
2
CCO '99 P3 - Manelzuma's Revenge
CCO
10
28.6%
2
Mock CCO '19 Contest 2 Problem 5 - A Geometry Problem
Mock CCO
12p
4.3%
2
ICHB Selection Contest '17 Problem 1 - Airship Fights (Correct Version)
Uncategorized
30p
9.1%
2
A Floyd-Warshall Problem
Uncategorized
15
0.6%
2
String Test
Data Structure Tests
50
3.4%
2
Bane of Arthropods
Uncategorized
20p
62.5%
2
CEOI '19 P1 - Building Skyscrapers
CEOI
30p
6.9%
2
COCI '19 Contest 6 #3 Konstrukcija
COCI
20p
21.4%
2
NOI '10 P6 - Happily Growing
China NOI
50p
2.6%
2
NOI '10 P5 - Route Planning
China NOI
35p
5.7%
2
WC '02 Suicidal P3 - Evil Tasks
Woburn Challenge
25
33.3%
2
WC '15 Finals S5 - Supply Chain
Woburn Challenge
30p
9.8%
2
WC '18 Contest 2 S4 - Car Convergence Chaos
Woburn Challenge
25p
1.6%
2
WC '17 Finals S5 - Crop Rectangles
Woburn Challenge
25p
1.7%
2
Anti-Fire Fox
Uncategorized
25p
6.7%
2
Rubik's Cube Solver
Uncategorized
50p
0.7%
2
ICPC SWERC 2017 C - Macarons
ICPC
17
28.6%
2
ICPC PACNW 2010 I - Zombie Fences 2: Electric Boogaloo
ICPC
35p
11.8%
2
World Tour Contest Problem 3 — Translation
Seasonal
10p
0.1%
2
COCI '16 Contest 7 #5 Paralelogrami
COCI
17p
4.0%
2
COCI '10 Contest 5 #6 Slika
COCI
20p
7.4%
2
COCI '12 Contest 4 #6 Akvarij
COCI
25p
8.7%
2
COCI '17 Contest 6 #6 Vrtić
COCI
25p
4.0%
2
JOI '20 Spring Camp Day 1 P3 - Sweeping
JOI
25p
18.2%
2
JOI '20 Spring Camp Day 2 P3 - Ruins 3
JOI
40p
33.3%
2
DMOPC '20 Contest 5 P6 - Top Row (Offline Version)
DMOPC
30p
22.2%
2
Calendar Contest Problem 5 — Reign of Terror
Uncategorized
15
3.3%
2
Calendar Contest Problem 6 — Ming Dynasty
Seasonal
25
3.5%
2
«
1
2
...
95
96
97
98
99
100
»