Description

Calculation 1 -2 +3 -4+...+n

Input

Input repeat times  m  first,  then  input n each  time.

Output

outut  sum of  1 -2 +3 -4+...+n

Sample Input

4100100010000100000

Sample Output

-50-500-5000-50000

HINT

 

#include<stdio.h>

int main()

{

int i,m,n,t;

long long sum;

scanf("%d",&m);

for(i=1;i<=m;i++)

{

scanf("%d",&n);

sum=0;

for(t=1;t<=n;t++)

{if(t%2==0)

{sum=sum-t;}

if(t%2==1)

{sum=sum+t;}}

printf("%lld\n",sum);}

return 0;

}