백준[Java] 2439번 별 찍기 -2

https://www.acmicpc.net/problem/2439

2439번: 별 찍기 - 2

문제 풀이 1

import java.util.Scanner;
public class _2439_1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        for (int i = 1; i <= N; i++) {
            for (int j = 0; j < N-i; j++) {
                System.out.print(' ');
            }
            for (int j = 1; j <= i; j++) {
                System.out.print('*');
            }
            System.out.println();
        }
    }
}

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문제 풀이 2

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

public class _2439_2 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        br.close();

        for (int i = 1; i <= N; i++) {
            for (int j = 0; j < N-i; j++) {
                System.out.print(' ');
            }
            for (int j = 1; j <= i; j++) {
                System.out.print('*');
            }
            System.out.println();
        }
    }
}

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문제 풀이 3

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class _2439_3 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int N = Integer.parseInt(br.readLine());
        br.close();

        for (int i = 1; i <= N; i++) {
            for (int j = 0; j < N-i; j++) {
                bw.write(' ');
            }
            for (int j = 1; j <= i; j++) {
                bw.write('*');
            }
            bw.newLine();
        }
        bw.flush();
        bw.close();
    }
}

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문제 풀이 4

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

public class _2439_4 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        br.close();

        StringBuilder sb = new StringBuilder();
        for (int i = 1; i <= N; i++) {
            for (int j = 0; j < N-i; j++) {
                sb.append(' ');
            }
            for (int j = 1; j <= i; j++) {
                sb.append("*");
            }
            sb.append('\n');
        }
        System.out.println(sb);
    }
}

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