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OI-codes/Luogu/P1928/P1928.cpp

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// https://www.luogu.com.cn/record/38657002
#include <bits/stdc++.h>
using namespace std;
string cnm() {
int n;
char ch;
string s = "";
string str = "";
while (cin >> ch) {
if (ch == '[') {
cin >> n;
str = cnm();
while (n--) {
s += str;
}
}
else if (ch == ']') {
return s;
}
else {
s += ch;
}
}
return s;
}
int main() {
cout << cnm() << endl;
return 0;
}