cf
/
mirror
Problemset
Contests
Favorites
Profile
Tools
Settings
Problemset
Contests
Favorites
Profile
Complexity
Stress
Graph
Templates
Crawler
Lamps in a Line
☆
save
CF
100E
1600
· expert
1s
256 MB
⌨ stdin/stdout
#*special
#math
hide
Examples
Sample 1
of 2
Input
copy
2
off off
2
1 2
Output
copy
on off
Sample 2
of 2
Input
copy
3
off off on
6
1 1 1 1 2 2
Output
copy
off off on
58%
100E.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