Leetcode no. 165

165. Compare Version Numbers

Compare two version numbers version1 and version2.
If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.

You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not "two and a half" or "half way to version three", it is the fifth second-level revision of the second first-level revision.

Here is an example of version numbers ordering:

0.1 < 1.1 < 1.2 < 13.37

public class Solution {    public int compareVersion(String version1, String version2) {        String[] v1= version1.split("\\.");        String[] v2= version2.split("\\.");        int length= Math.max(v1.length,v2.length);        for (int i = 0; i < length; i++) {            int a= i< v1.length ? Integer.parseInt(v1[i]) : 0;            int b= i< v2.length ? Integer.parseInt(v2[i]) : 0;            if (a<b) return -1;            else if (a>b) return 1;        }        return 0;    }}