1986. 지그재그 숫자.D2

 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Solution {
 
    public static void main(String[] args) throws NumberFormatException, IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        int T = Integer.parseInt(br.readLine());
        
        for (int tc = 1; tc <= T; tc++) {
            
            int N = Integer.parseInt(br.readLine());
            
            int sum=0;
            for(int i =1;i<=N;i++) {
                if(i%2==1) {
                    sum+=i;
                }else if(i%2==0) {
                    sum-=i;
                }
            }
            sb.append("#").append(tc).append(" ").append(sum).append("\n");
        }
        System.out.println(sb);
    }
}