백준 2523 java

import java.util.Scanner;

public class bj2523 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N, i, j;

        N = scanner.nextInt();
        for(i = 0; i < N; i++)
        {
            for(j = 0; j <= i; j++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
        for(i = N - 1; i > 0; i--)
        {
            for(j = 0; j < i; j++)
            {
                System.out.print("*");
            }
            System.out.println();
        }

        scanner.close();
    }
}