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Finding the longest palindromic substring means identifying the longest contiguous sequence in a string that reads the same forwards and backwards. This is different from the longest palindromic subsequence, which does not require characters to be contiguous.
Expand Around Center Approach (O(n²) Time)
This is one of the most efficient and straightforward methods for this problem.
Steps:
Iterate through each character in the string, treating it as a potential palindrome center.
Expand outwards for both odd-length and even-length palindromes.
Track the longest palindrome found during expansion.
Code Example:
function longestPalindrome(s) {if (!s || s.length < 1) return "";let start = 0, end = 0;for (let i = 0; i < s.length; i++) {let len1 = expandFromCenter(s, i, i); // Odd lengthlet len2 = expandFromCenter(s, i, i + 1); // Even lengthlet len = Math.max(len1, len2);if (len > end - start) {start = i - Math.floor((len - 1) / 2);end = i + Math.floor(len / 2);}}return s.substring(start, end + 1);}function expandFromCenter(str, left, right) {while (left >= 0 && right < str.length && str[left] === str[right]) {left--;right++;}return right - left - 1;}// Example usage:console.log(longestPalindrome("babad")); // "bab" or "aba"console.log(longestPalindrome("cbbd")); // "bb"コピーしました。✕コピー Longest Palindromic Subsequence in JavaScript - GeeksforGeeks
2025年7月23日 · A Longest Palindromic Subsequence in JavaScript refers to the longest sequence of characters within a string that reads the same backward and forward. It's a non-contiguous …
geeksforgeeks.org の検索結果のみを表示Longest Palindromic Substring
Generate all possible substrings of the given string. For each substring, check if it is a palindrome. If it is, update the result if its length is greater than the longest …
Longest Palindromic Substring - LeetCode
Longest Palindromic Substring - Given a string s, return the longest palindromic substring in s. Example 1: Input: s = "babad" Output: "bab" Explanation: "aba" is …
The Longest Palindromic Substring in JavaScript
2024年2月26日 · Explore the 'Longest Palindromic Substring' problem: its relevance in web development and four JavaScript (ES6 & TypeScript) solutions for efficiency.
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JavaScript: The longest palindrome in a specified string
2025年2月28日 · Write a JavaScript function that computes the longest palindromic substring in a string using nested loops for comparison. Write a …
javascript - Finding Longest Palindromic Substring - Stack ...
2023年9月2日 · You can optimize the code and avoid running into memory errors, by implementing a more efficient algorithm, such as Manacher's algorithm. Manacher's algorithm is designed specifically …
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Longest Palindromic Substring: JavaScript - DEV Community
2022年4月13日 · Both of these strings contain palindromic substrings 'oo'. Find the longest set of characters in a string that is a palindrome, or the 'longest palindromic substring'. There are a few …
Longest Palindromic Substring - LeetCode javascript solutions
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Example 2: …
Longest Palindromic Substring - JavaScript Coding Challenge ...
Longest Palindromic Substring - JavaScript: Explore the JavaScript approach to finding the longest palindromic substring. View practical examples and explanations.
Longest Palindromic Substring - GeeksforGeeks
2025年10月3日 · Generate all possible substrings of the given string. For each substring, check if it is a palindrome. If it is, update the result if its length is greater than the longest palindrome found so far.
Discovering the Longest Palindromic Substring in …
2024年4月26日 · In this guide, I will show you how to efficiently find the longest palindromic substring within a given string. The longest palindromic substring …
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