[백준] 8393번 : 합 - Java

https://www.acmicpc.net/problem/8393

8393번: 합

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입력 방식

• Scanner
• BufferedReader

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풀이

1. Scanner

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.close();
        
        int sum = 0;
        for (int i = 1; i <= n; i++) {
            sum += i;
        }
        System.out.println(sum);
    }
}

 

2. BufferedReader

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
 
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());
        br.close();
        
        int sum = 0;
        for(int i = 1 ; i <= n ; i++) {
            s += i;
        }
        System.out.println(sum);
    }
}

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성능

• BufferedReader > Scanner