516. Longest Palindromic Subsequence LeetCode Solution

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Longest Palindromic Subsequence Given a string s, find the longest palindromic subsequence‘s length in s.

subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements.

Example 1:

Input: s = "bbbab"
Output: 4
Explanation: One possible longest palindromic subsequence is "bbbb".

Example 2:

Input: s = "cbbd"
Output: 2
Explanation: One possible longest palindromic subsequence is "bb".

Constraints:

  • 1 <= s.length <= 1000
  • s consists only of lowercase English letters.

Longest Palindromic Subsequence Solutions

Time: O(n)
Space: O(n)

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