# include "coins.h"
//# include "grader.cpp"
std::vector<int> coin_flips(std::vector<int> b, int c)
{
int x=0;
for(int i=0;i<64;i++)
if(b[i]) x^=i;
return {x^c};
}
int find_coin(std::vector<int> b)
{
int x=0;
for(int i=0;i<64;i++)
if(b[i]) x^=i;
return x;
}
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