#include <iostream>
#include <string>
using namespace std;
void binString(int n, int lastPlace, string ans) {
if(n == 0) {
cout << ans << endl;
return;
}
if(lastPlace != 1) {
binString(n-1, 0, ans+'0');
binString(n-1, 1, ans+'1');
} else {
binString(n-1, 0, ans + '0');
}
}
void binString(int n, string ans) {
if(n == 0) {
cout << ans << endl;
return;
}
if(ans[ans.size()-1] != '1') {
binString(n-1, ans+'0');
binString(n-1, ans+'1');
} else {
binString(n-1, ans + '0');
}
}
int main() {
string ans = " ";
binString(3, ans);
return 0;
}
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