#include "coins.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(__i, __a, __b) for(ll __i = __a; __i <= __b; __i++)
vector<int> coin_flips(vector<int> b, int c) {
ll r = 0;
FOR(i, 1, 63){
if(b[i]) r ^= i;
}
vector<int> rv;
if(r != c) {
FOR(i, 0, 63) {
if(r ^ i == c) {
rv.push_back(i);
return rv;
}
}
}else{
rv.push_back(0);
}
return rv;
}
int find_coin(vector<int> b) {
ll r = 0;
FOR(i, 1, 63){
if(b[i]) r ^= i;
}
return r;
}
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