cf
/
mirror
Problemset
Contests
Favorites
Profile
Tools
Settings
Problemset
Contests
Favorites
Profile
Complexity
Stress
Graph
Templates
Crawler
Beautiful numbers
☆
save
CF
55D
2500
· grandmaster
4s
256 MB
⌨ stdin/stdout
#dp
#number theory
hide
Examples
Sample 1
of 2
Input
copy
1
1 9
Output
copy
9
Sample 2
of 2
Input
copy
1
12 15
Output
copy
2
58%
55D.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