SPOJ 4300 - Rectangles

Problem Statement

Hint: If the input is 15 squares
rectangles are-
                1x1 1x2 1x3 ...................................1x15
                       2x2 2x3 ............................2x7    
                              3x3   ....................3x5
                        

• can't make 3x2 cause 3x2 and 2x3 are same.
• can't make 2x8 cause that requires 16 squares.
• can't make 4x4 cause that also requires 16 square. 

Solution:

#include<stdio.h>
int main()
{
    int n,c=0,i,j;
    scanf("%d",&n);
    for(i=1;i*i<= n;i++)
    {
        c+= (n/i)-i+1;
    }
    printf("%d\n",c);
}

* If there's any query or mistake, let me know.