package org.enricogiurin.codingchallenges.leetcode.challenge092020;

/*
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.

You may assume the default revision number for each level of a version number to be 0. For example, version number 3.4
has a revision number of 3 and 4 for its first and second level revision number. Its third and fourth level revision number are both 0.



Example 1:

Input: version1 = "0.1", version2 = "1.1"
Output: -1
Example 2:

Input: version1 = "1.0.1", version2 = "1"
Output: 1
Example 3:

Input: version1 = "7.5.2.4", version2 = "7.5.3"
Output: -1
Example 4:

Input: version1 = "1.01", version2 = "1.001"
Output: 0
Explanation: Ignoring leading zeroes, both “01” and “001" represent the same number “1”
Example 5:

Input: version1 = "1.0", version2 = "1.0.0"
Output: 0
Explanation: The first version number does not have a third level revision number, which means its third level revision
number is default to "0"


Note:

Version strings are composed of numeric strings separated by dots . and this numeric strings may have leading zeroes.
Version strings do not start or end with dots, and they will not be two consecutive dots.
 */
//@regexp
public class CompareVersionNumbers {
    public int compareVersion(String version1, String version2) {
        String[] split1 = version1.split("\\.");
        String[] split2 = version2.split("\\.");
        for (int j = 0; j < split1.length || j < split2.length; j++) {
            int t1 = j < split1.length ? Integer.parseInt(split1[j].trim()) : 0;
            int t2 = j < split2.length ? Integer.parseInt(split2[j].trim()) : 0;
            if (t1 == t2) {
                continue;
            }
            return t1 < t2 ? -1 : 1;
        }
        return 0;
    }

    public static void main(String[] args) {
        String s1 = "1";
        String s2 = "1.1";

        int result = new CompareVersionNumbers().compareVersion(s1, s2);
        System.out.println(result);
    }
}
