P1928 外星密码

#include <iostream> using namespace std; string read() { int n; string s1 = "", s2; char ch; while (cin >> ch) { if (ch == '[') { cin >> n; s2 = read(); while (n--) { s1 += s2; } } else { if (ch == ']') { return s1; } else { s1 += ch; } } } } int main() { cout << read(); return 0; }