Codeforces Round #652 (Div. 2) D題

原題連接:https://codeforces.com/contest/1369/problem/D 思路:樹形DP 源碼:ios #include <iostream> #include <algorithm> using namespace std; const int mod = 1e9+7; const int maxn = 2000010; long long dp[maxn][2] =
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