WA in PD13 (Divisor Summation)

I used this code for the problem ( http://www.codechef.com/problems/PD13/ ).I tried as many test cases I could think of and get correct answer on each one of them but whenever I submit it shows wrong answer.Please advise.Hereā€™s the code.(math.h is included it wont show somehow :stuck_out_tongue: )
#include
#include<math.h>
long long divsum(long n);
int main()
{
long cases,num,x=0;
scanf("%ld",&cases);
for(long j=0;j<cases;j++)
{
scanf("%ld",&num);
if(num==1||num==0)
{
printf("%d\n",x);
}
else
{
printf("%lld\n",divsum(num));
}
}
}
long long divsum(long n)
{
long k;
long long sum=0;
k=(long)sqrt((float)n);
if(n%2!=0)
{
for(long i=1;i<=k;i+=2)
{
if(n%i==0)
{
sum+=i+n/i;
}
}
}
else
{
for(int i=1;i<=k;i++)
{
if(n%i==0)
{
sum+=i+n/i;
}
}
}
return sum-n;
}

If the number is a perfect square , you will end up adding the square root of it twice .

2 Likes

thanx a lot sir fixed my mistake :slight_smile: