https://www.acwing.com/problem/content/description/340/
It’s the first time to do this kind of numbering, and it feels like it is the same in theory , The return is not 1 but his contribution
https://www.acwing.com/problem/content/description/340/
It’s the first time to do this kind of numbering, and it feels like it is the same in theory , The return is not 1 but his contribution