洛谷1928题解小记

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

int f(int i) {
	if (i >= s.size())
		return s.size();
	string tmp = "";
	while (s[i] >= 'A' && s[i] <= 'Z') {
		tmp += s[i];
		i++;
	}
	cout << tmp;
	if (s[i] == '[') {
		i++;
		int num = 0;
		while (s[i] >= '0' && s[i] <= '9') {
			num = num * 10 + (s[i] - '0');
			i++;
		}
		num = (num == 0) ? 1 : num;
		for (int j = 1; j <= num - 1; j++)
			f(i);
		i = f(i);
		return f(i);
	} else
		return i + 1;
}

int main() {
	cin >> s;
	f(0);
	return 0;
}