#include "coins.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> coin_flips(vector<int> b,int c) {
int xr = 0;
for (int i = 0;i<64;i++) if (b[i])xr^=i;
vector<int> a;a.push_back(xr^c);
return a;
}
int find_coin(vector<int> b) {
int xr = 0;
for (int i = 0;i<64;i++) if (b[i]) xr^=i;
return xr;
}
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