How to Compare Version Number Strings Using Two Pointers in Java

A common coding problem requires comparing two version strings, each made up of dot-separated revision numbers, and returning 1, -1, or 0 based on which is greater. The approach involves traversing both strings simultaneously using two pointers, parsing one revision at a time without splitting the full string. Missing revisions in a shorter version are treated as zero, ensuring accurate comparison when versions have different lengths. This method achieves O(N + M) time complexity and O(1) space complexity, making it highly efficient. The technique is applicable to related problems such as String to Integer, Roman to Integer, and Basic Calculator.