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