cf
/
mirror
Problemset
Contests
Favorites
Profile
Tools
Settings
Problemset
Contests
Favorites
Profile
Complexity
Stress
Graph
Templates
Crawler
Bishwock
☆
save
CF
991D
1500
· specialist
1s
256 MB
⌨ stdin/stdout
#dp
#greedy
hide
Examples
Sample 1
of 4
Input
copy
00
00
Output
copy
1
Sample 2
of 4
Input
copy
00X00X0XXX0
0XXX0X00X00
Output
copy
4
Sample 3
of 4
Input
copy
0X0X0
0X0X0
Output
copy
0
Sample 4
of 4
Input
copy
0XXX0
00000
Output
copy
2
58%
991D.cpp
GNU C++20 (64)
GNU C11
Python 3
PyPy 3
Java 21
Rust
Go
C#
JavaScript
Ruby
Pascal
Haskell
Kotlin · no run
loading editor…
Ln
11
·
137 B
GNU C++20 (64)
⟲ Reset
Run samples
Submit
▸
Custom test
run your code against any stdin
▸
Stress test
run a brute + generator against your solution to find a failing case
▸
Editorial & videos
official tutorial + youtube — hidden while contest is live