gray c++
vector <string> a;
a={"0","1"};
int i, j;
for (i = 2; i < (1<<n); i = i<<1)
{
for (j = i-1 ; j >= 0 ; j--)
a.push_back(a[j]);
for (j = 0 ; j < i ; j++)
a[j] = "0" + a[j];
for (j = i ; j < 2*i ; j++)
a[j] = "1" + a[j];
}
for (i = 0 ; i < a.size() ; i++ )
cout << a[i] << " ";
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