2020杭電多校第四場補題

1004.Deliver the Cakephp 賽時死都找不出bug，賽後看了題解，發現只要建2*n的邊就能夠了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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