我的代码：

//P1928 外星密码 9 * AC + 1 * MLE
#include <bits/stdc++.h>

using namespace std;

int timetimetime;
char ch;

string fz(){
	string ans = "", X = "";
	while((ch = getchar()) && (ch != '\n')){
		if(ch == '['){
			scanf("%d", &timetimetime);
			X = fz();
			for(int i = 1; i <= timetimetime; i++)
				ans += X;
		}else{
			if(ch == ']')
				return ans;
			ans += ch;
		}
	}
}

int main(){
	cout << fz();
	return 0;
}

我想请教一下大佬们！ https://www.luogu.com.cn/record/129826742