[백준 2445번] 별 찍기 - 8

import java.util.Scanner;
 
class MainClass{
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
 
        for(int i = 0; i < num; ++i){
            for(int j = 0; j < i+1; ++j){
                System.out.print("*");
            }
            for(int k = 0; k < (num-i-1)*2; ++k) {
                System.out.print(" ");
            }
            for(int j = 0; j < i+1; ++j){
                System.out.print("*");
            }
            //8 6 4 2 0
            System.out.println();
        }
        for(int i = 0; i < num-1; ++i){
            for(int j = 0; j <num-1-i ; ++j){
                System.out.print("*");
            }
            for(int k = 0; k < i*2+2; ++k){
                System.out.print(" ");
            }
            for(int j = 0; j <num-1-i ; ++j){
                System.out.print("*");
            }
             System.out.println();
        }
    }
}

 

출처 : www.acmicpc.net/problem/2445