SWEA 1986 지그재그 숫자

1 개요

SWEA 1986 지그재그 숫자

• https://www.swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=

SW Expert 아카데미

#	문제	풀이

3 Java

import java.util.Scanner;
class Solution {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        int T = sc.nextInt();
        for( int t=1; t<=T; t++ ) {
            int n = sc.nextInt();
            int sum = 0;
            for( int i=1; i<=n; i++ ) {
                sum += ( (i%2==0) ? -1 : 1 ) * i;
            }
            System.out.format("#%d %d\n", t, sum);
        }
    }
}