一道C题目

#include <stdio.h>
#include <math.h>

int main()
{
    long int sum;
    long int a,b;
    int ka = 0,kb,i,j;
    printf("Enter sum:\n");
    scanf("%ld",&sum);
    for(a = 100; a <= sum; a++)
    {
        b = sum -a;
        if(b < 100)
        {
            return 0;
        }
        ka = (long int)sqrt(a);
        kb = (long int)sqrt(b);
        i = 100 > ka ? 100 : ka;
        for(; i <= a; i++)
        {
            if(a%i == 0)
            {
                j = 100 > kb ? 100 : kb;
                for(; j <= b; j++)
                {
                    if(b%j == 0)
                    {
                        printf("m = %d,n = %d,x = %d,y = %d\n",b/j,a/i,j,i);
                    }
                }
            }
        }
    }
    
    return 0;    
}