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