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