题解 | 牛牛的字符菱形

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String ch = in.next();
        int n = 5;  
        int num = n / 2; 
        for (int i = 1; i <= num; i++) {
            for (int j = i; j <= num; j++) {
                System.out.print(" ");
            }
            for (int j = 1; j <= 2 * i - 1; j++) {
                System.out.print(ch);
            }
            System.out.println();
        }
        for (int i = 1; i <= n; i++) {
            System.out.print(ch);
        }
        System.out.println();
        for (int i = num; i >= 1; i--) {
            for (int j = i; j <= num; j++) {
                System.out.print(" ");
            }
            for (int j = 1; j <= 2 * i - 1; j++) {
                System.out.print(ch);
            }
            System.out.println();
        }
    }
}