题解 | #牛牛的字符菱形#

#include <iostream>
using namespace std;

int main() {
    char a;
    int n = 3;

    cin >> a;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            cout << " ";
        }
        for (int j = 0; j < 2 * i + 1; j++) {
            cout << a;
        }
        cout << endl;
    }

    for (int i = n - 1; i > 0; i--) {

        for (int j = 0; j < n - i; j++) {
            cout << " ";
        }

        for (int j = 0; j < 2 * i - 1; j++) {
            cout << a;
        }

        cout << endl;

    }

    return 0;
}