[D1] SWEA - 2025. N줄덧셈 : Java

처음으로 바로 푼 문제! 

 

import java.util.Scanner;
import java.io.FileInputStream;

class Solution
{
	public static void main(String args[]) throws Exception
	{
	    Scanner sc = new Scanner(System.in);
            int n = sc.nextInt();
            int sum = 0;
            for(int i = 1; i <= n; i++) {
          	  sum += i;
            }
            System.out.println(sum);
	}
}