[BOJ/C++] 2444 별 찍기 - 7

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#include <iostream>

using namespace std;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int N;
	cin >> N;
	for (int i = 1; i <= N; i++) {
		for (int j = 0; j < N - i; j++)
			cout << " ";
		for (int j = 0; j < i*2-1; j++)
			cout << "*";
		cout << "\n";
	}
	for (int i = N-1; i >=0; --i) {
		for (int j = 0; j < N - i; j++)
			cout << " ";
		for (int j = 0; j < i * 2 - 1; j++)
			cout << "*";
		cout << "\n";
	}
}