[백준 2445번 ː 자바(JAVA)] 별 찍기 - 8

 

import java.util.*;


public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        
        for(int i=0,j=1; i<2*n; i++) {
            for(int k=0; k<2*n; k++) {
                System.out.print(k>=j && k<2*n-j?" ":"*");
            }
            if(i<n-1)
                j++;
            else
                j--;
            
            System.out.println();
        }     
        sc.close();
    }
}