Answer 1

int sum(int a[],int s,int b[],int s1)
{
int sum,sum1,i;
for(i=0;i<s;i++)
sum+=a[i];
for(i=0;i<s1;i++)
sum1+=b[i];

sum= sum-sum1;
return sum;
}

here s and s1 size of array a and b.