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