RE求条

#include <bits/stdc++.h>
using namespace std;

string dg(){
	int k;
	char c;
	string s = "", ss = "";
	while(cin >> c){
		if(c == '['){
			cin >> k;
			ss = dg();
			while(k--)
				s += ss;
		}else if(c == ']') return s;
		else s += c;
	}
}

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