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
4 100 1000 10000 100000
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;
}
