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Codility---CountFactors

2024-10-05 19:02:02   222人阅读

Task description

A positive integer D is a factor of a positive integer N if there exists an integer M such that N = D * M.

For example, 6 is a factor of 24, because M = 4 satisfies the above condition (24 = 6 * 4).

Write a function:

class Solution { public int solution(int N); }

that, given a positive integer N, returns the number of its factors.

For example, given N = 24, the function should return 8, because 24 has 8 factors, namely 1, 2, 3, 4, 6, 8, 12, 24. There are no other factors of 24.

Assume that:

  • N is an integer within the range [1..2,147,483,647].

Complexity:

  • expected worst-case time complexity is O(sqrt(N));
  • expected worst-case space complexity is O(1).

 

Solution
 
Programming language used: Java
Code: 15:02:17 UTC, java, final, score:  100
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// you can also use imports, for example:// import java.util.*;// you can write to stdout for debugging purposes, e.g.// System.out.println("this is a debug message");class Solution {    public int solution(int N) {        // write your code in Java SE 8        int count = 0, i=1;        double max = Math.sqrt(N);        for(; i < max; i++) {            if(N % i ==0) {                count += 2;            }        }        if(i*i == N){            count++;        }        return count;    }}


https://codility.com/demo/results/training5YTT4B-5NP/

 

Codility---CountFactors


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