#include "coins.h"
using namespace std;
std::vector<int> coin_flips(std::vector<int> b, int c) {
std::vector<int> flips(1);
int sum = c;
for (int i = 0; i < 64; ++i) {
if (b[i]) {
sum ^= i;
}
}
flips = {sum};
return flips;
}
int find_coin(std::vector<int> b) {
int sum = 0;
for (int i = 0; i < 64; ++i) {
if (b[i]) {
sum ^= i;
}
}
return sum;
}
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