#include <bits/stdc++.h>
#include "coins.h"
using namespace std;
vector<int> coin_flips(vector<int> b, int c) {
vector<int> flips(1);
int res = 0;
for(int i=0;i<b.size();i++) if(b[i]) res ^= i;
flips[0] = (res ^ c);
return flips;
}
int find_coin(vector<int> b) {
int res = 0;
for(int i=0;i<b.size();i++) if(b[i]) res ^= i;
return res;
}
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