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#include <stdio.h>
int findDifference(int n, int arr[])
{
int odd=0, even=0;
for(int i=0; i<n; i++)
{
if(i%2==0)
{
even = even + arr[i];
}
else
{
odd = odd + arr[i];
}
}
return even-odd;
}
int main()
{
int n;
scanf("%d",&n);
int array[n];
for(int i=0; i<n; i++)
{
scanf("%d",&array[i]);
}
int result = findDifference(n, array);
printf("%d",result);
return 0;
}