2020杭电多校第四场补题

1004.Deliver the Cakephp 赛时死都找不出bug，赛后看了题解，发现只要建2*n的边就能够了node #include<bits/stdc++.h> using namespace std; #define ll long long #define pf printf #define pi acos(-1) #define pb push_back const int mod

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