牛客小白月賽11 Rinne Loves Xor

題目鏈接：https://ac.nowcoder.com/acm/contest/370/I code: #include<bits/stdc++.h> using namespace std; typedef unsigned long long ll; ll mod=1e9+7; ll pow(ll x,ll n,ll mod) { ll res=1; while(n>0) {

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