#include "coins.h"
#include <cstdlib>
#include <iostream>
#include <vector>
using namespace std;
vector<int> coin_flips(vector<int> b, int c) {
int hash = 0;
for (int i = 0; i <= 63; i++)
if (b[i])
hash ^= i;
return {hash ^ c};
}
int find_coin(vector<int> b) {
int hash = 0;
for (int i = 0; i <= 63; i++)
if (b[i])
hash ^= i;
return hash;
}
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