[백준] 2523 별찍기-13 c++

#include <iostream>

using namespace std;

int main(void) {
	ios::sync_with_stdio(NULL);
	cin.tie(NULL);
	cout.tie(NULL);

	int num;
	cin >> num;
	for (int i = 0; i < num; i++) {
		for (int j = 0; j < i+1; j++) {
			cout << "*";
		}
		cout << "\n";
	}

	for (int i = num - 1; i >= 0; i--) {
		for (int j = 0; j < i; j++) {
			cout << "*";
		}
		cout << "\n";
	}
	return 0;
}