Codeforces Round #568 (Div. 2) G2. Playlist for Polycarp (hard version)

因爲不會打公式，隨意就先將就一下？ #include<cstdio> #include<algorithm> #include<iostream> #include<cstring> #include<vector> using namespace std; typedef long long LL; const int N=55; const int MOD=1e9+7; int add (in

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