#include <iostream>
#include <string>
using std::cout;
using std::endl;
void printBinary(int digits){
printBinaryHelper(digits, "");
}
void printBinaryHelper(int digits, string s){
if (digits == 0)
cout << s << endl;
else {
printBinaryHelper(digits-1, "0"+s);
printBinaryHelper(digits-1, "1"+s);
}
}
int main() {
printBinary(3);
return 0;
}
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