OI-codes/AcWing/727/727.cpp

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n / 2 + 1; i++) {
        for (int j = 1; j <= n / 2 + 1 - i; j++) {
            cout << ' ';
        }
        for (int j = 1; j <= 2 * i - 1; j++) {
            cout << '*';
        }
        cout << endl;
    }
    for (int i = 1; i <= n / 2; i++) {
        for (int j = 1; j <= i; j++) {
            cout << ' ';
        }
        for (int j = 1; j <= 2 * ((n / 2 + 1) - i) - 1; j++) {
            cout << '*';
        }
        cout << endl;
    }
    return 0;
}