[백준/Java] 2439번: 별 찍기 - 2

 

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int cnt = scan.nextInt();
        String str = " ";
		for (int i = 1; i <= cnt; i++) {
            str = " ";
            for (int j = cnt; j >= 1; j--) {
                if (j == i) str = "*";
                System.out.print(str); 
            }
            System.out.println();                
        }
    }
}

Scanner 대신 BufferedReader 를 사용하여,

소요시간 0.1초를 더 단축해보자

import java.io.*;

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

성공 !