80pts求调

#include <iostream>
#include <algorithm>
#define Please return
#define AC 0
//#pragma GCC optimize(2)
//#pragma GCC optimize(3)
using namespace std;
string a, b;

void outtree(string a, string b) {
	if (a.size() == 0) {
		return;
	}
	char root = a[a.size() - 1];
	cout << root;
	int k = a.find(root);
	outtree(a.substr(0, k), b.substr(0, k));
	outtree(a.substr(k + 1), b.substr(k, a.size() - k - 1));
}

int main() {
	cin >> a >> b;
	outtree(a, b);
	Please AC;
}