You might want to check out Pollard Rho algorithm.

On Sat, Aug 27, 2011 at 9:57 PM, Rahul Verma <[email protected]> wrote:
> I am trying to submit solution for the SPOJ DIVSUM problem, but it returns
> the time limit exceeded. Code submitted by me is below:
>
> #include <cstdlib>
> #include <iostream>
> using namespace std;
> int proper_divisor(int number);
> int main()
> {
>     int test,i,number;
>     cin>>test;
>     for(i=0; i<test; i++)
>     {
>         cin>>number;
>         proper_divisor(number);
>     }
> }
> int proper_divisor(int number)
> {
>     int i,n=0;
>     for(i=1; i<number-1; i++)
>     {
>         if(number%i==0)
>         {
>            n=n+i;
>         }
>     }
>     //cout<<n<<"\n";
> }
>
>
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-- 
Gaurav Menghani

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