백준(java)별찍기 7 - 2444

2443번과 2442번을 적절하게 조합하면 된다.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int N = Integer.parseInt(br.readLine());
		for(int i = 1;i<=N-1;i++) {
			for(int j = i;j<N;j++) {
				System.out.print(" ");
			}
			for(int k = 0;k<i*2-1;k++) {
				System.out.print("*");
			}
			System.out.println();
		}
		for(int i = 1;i<=N;i++) {
			for(int j = 1;j<i;j++) {
				System.out.print(" ");
			}
			for(int k = (2*N)-(i*2-1);k>0;k--) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
}