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  2. Java
  3. Object Oriented Programming
  4. Java Interface
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Java Interface

  • wooddoo
     + 2 comments

    When talking about math, it only requires to loop from 1 to sqrt(n):

        public int divisor_sum(int n){       
        int sum=0;
        int sqrt = (int)Math.sqrt(n);
        for (int i=1; i<=sqrt; i++)
            if (n%i==0)
                sum = sum + i + n/i;
        if (n == sqrt*sqrt)
            sum = sum-sqrt;
            
        return sum;      
    }