Compare version numbers

Short summary

This tutorial teaches how to compare version strings by parsing dot-separated revisions and comparing them numerically. Two solutions are presented: a brute force approach using split (O(N+M) space) and an optimized two-pointer method (O(N+M) time, O(1) space). The post includes working Java code, complexity analysis, and example test cases.

• •Parse version strings by extracting numeric revisions between dots
• •Compare corresponding revisions sequentially; treat missing revisions as 0
• •Two-pointer approach trades array space for in-place string parsing efficiency

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