#include "coins.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> coin_flips(vector<int> b, int c) {
int k =0;
vector<int> flip;
for(int i=0; i<=63; i++){
if(b[i]==1){
k^=i;
}
}
int y=c^k;
flip.push_back(y);
return flip;
}
int find_coin(vector<int> b) {
int idx=0;
for(int i=0; i<=63; i++){
if(b[i]==1){
idx^=i;
}
}
return idx;
}
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