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
...
76
77
78
79
80
81
...
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
Educational DP Contest AtCoder L - Deque
CCC '04 S4 - Space Turtle
IOI '04 P4 - Phidias
COCI '14 Contest 6 #4 Kratki
A Game
CCO '23 P1 - Binaria
Educational DP Contest AtCoder H - Grid 1
Problem
Category
Points
AC % ▾
Users
Heap Dijkstra Revisited
Data Structure Tests
10
14.3%
10
Mock CCO '19 Contest 1 Problem 5 - A Tree Problem
Mock CCO
25p
14.3%
6
OCC '19 G3 - Binary Game
Olympiads School
25p
14.3%
5
COCI '09 Contest 5 #6 Chuck
COCI
25p
14.3%
1
WC '15 Contest 3 S1 - Energy Absorption
Woburn Challenge
7p
14.3%
34
Google Code Jam '15 Qualification Round Problem D - Ominous Omino
Google Code Jam
12p
14.3%
3
TLE '17 Contest 8 P3 - Curious Numbers
TLE
10p
14.3%
70
DMOPC '20 Contest 4 P1 - Missing Numbers
DMOPC
5p
14.3%
357
DMOPC '21 Contest 10 P3 - Peculiar Reflections
DMOPC
12p
14.2%
75
DMOPC '21 Contest 3 P4 - Sorting Subsequences
DMOPC
20p
14.2%
32
The Contest Contest 1 P2 - A Typical CCC Senior Problem
Uncategorized
10p
14.2%
174
CCO '16 P2 - Splitting Hares
CCO
15p
14.2%
89
Mock CCO '18 Contest 4 Problem 1 - Mining for Minerals
Mock CCO
15p
14.2%
40
The Return of A Plus B
Seasonal
0p
14.2%
340
CCC '18 S3 - RoboThieves
CCC
12p
14.2%
1133
Another Contest 3 Problem 4 - Range Updates and Range Queries
ACC
15
14.2%
54
DMOPC '22 Contest 4 P1 - Alone Time
DMOPC
5p
14.2%
179
CCO '04 P4 - Return of Space Turtle
CCO
12
14.2%
46
TLE '16 Contest 6 (Mock CCC) J3 - Two Kangaroos
TLE
5p
14.2%
42
CCO '09 P4 - Bottle Caps
CCO
20p
14.2%
37
Mock CCC '24 Contest 1 S5 - Mock CCC 2025
Mock CCC
20p
14.2%
18
CCO '05 P6 - Windows
CCO
30p
14.2%
28
TLE '16 Contest 7 P2 - Judging
TLE
15p
14.2%
10
PEG Test '14 - Gift Delivery
Uncategorized
10
14.1%
12
COCI '08 Contest 2 #6 Cavli
COCI
25p
14.1%
25
Wesley's Anger Contest 2 Problem 4 - The Ninth Triangle of the Underworld
WAC
20
14.1%
11
DMOPC '16 Contest 3 P3 - Phantom Fight
DMOPC
10p
14.1%
98
RGPC '17 P4 - Snow Day
Uncategorized
10p
14.1%
100
CCC '17 S4 - Minimum Cost Flow
CCC
17p
14.1%
770
DMOPC '23 Contest 1 P2 - Knights on Chessboard
DMOPC
10p
14.1%
197
DMOPC '18 Contest 1 P4 - Sorting
DMOPC
12p
14.1%
85
DMPG '16 S2 - Pandemic
DMOPC
7p
14.1%
85
DMOPC '15 Contest 6 P3 - Harvest
DMOPC
7p
14.1%
314
DMOPC '18 Contest 5 P2 - A Photography Problem
DMOPC
7
14.1%
127
BSSPC '21 J4 - James's Magical Soups
Uncategorized
7p
14.1%
92
IOI '16 P1 - Detecting Molecules (Standard I/O)
IOI
12p
14.1%
230
CCO '17 P3 - Vera and Modern Art
CCO
30p
14.1%
93
NOIP '99 P2 - Palindrome Numbers
China NOI
7p
14.1%
25
CCC '10 S1 - Computer Purchase
CCC
5
14.0%
1316
Bulgarian OI '09 P5 - Special Sequence
Bulgarian OI
30p
14.0%
27
Sword Art Online Judge
Seasonal
7
14.0%
101
Mock CCC '23 1 S5 - The Obligatory Data Structures Problem
Mock CCC
25p
14.0%
10
DMOPC '22 Contest 1 P3 - Group Project
DMOPC
12p
14.0%
95
GFSSOC '15 Fall S5 - Raider
GFSSOC
17p
14.0%
137
Bubble Cup V9 I R3D3's summer adventure
Bubble Cup
25
14.0%
3
Back From Summer '17 P5: Confusing Codeforces Contest
Seasonal
25p
14.0%
29
A Simple Multiplication
Uncategorized
12
14.0%
17
Wesley's Anger Contest 6 Problem 4 - Runway Lights
WAC
12p
14.0%
87
MWC '15 #6 P3: Magical Sets
MWC
7p
14.0%
42
Mock CCO '18 Contest 2 Problem 3 - Victor Trains
Mock CCO
20p
14.0%
7
«
1
2
...
76
77
78
79
80
81
...
99
100
»