LeetCode 125 — Valid Palindrome | Java Solution & Explanation
Автор: codewithamod
Загружено: 2025-10-31
Просмотров: 331
Problem: Given a string, determine if it is a palindrome considering only alphanumeric characters and ignoring cases.
Example: "A man, a plan, a canal: Panama" - true, "race a car" - false.
What this video covers
Clear problem statement and constraints.
Intuitive two-pointer approach: advance left/right pointers, skip non-alphanumeric characters, compare characters case-insensitively.
Step-by-step walkthrough of a clean Java implementation.
Handling edge cases (empty string, only non-alphanumeric characters).
Time and space complexity analysis.
Tips for interview-style explanations and common pitfalls.
Complexity
Time: O(n) — single pass with two pointers.
Space: O(1) — constant extra space.
What you'll get
A working Java solution with explanation you can reproduce in interviews.
Best practices for writing readable, bug-resistant code for string manipulation problems.
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