Compare Version Numbers

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

A version number is a string containing one or more decimal numbers separated by dots. Each decimal number represents an element in the version number. The numbers may contain leading zeroes, and their positions in the string do matter. For example, 0.1 is less than 1.1, and 1.01 is less than 1.1.