Longest Palindromic Subsequence
Medium Accuracy: 78.79% Submissions: 4679 Points: 4

Given a String, find the longest palindromic subsequence.

Example 1:

S = "bbabcbcab"
Output: 7
Explanation: Subsequence "babcbab" is the
longest subsequence which is also a palindrome.

Example 2:

S = "abcd"
Output: 1
Explanation: "a", "b", "c" and "d" are
palindromic and all have a length 1.

Your Task:
You don't need to read input or print anything. Your task is to complete the function longestPalinSubseq() which takes the string S as input and returns an integer denoting the length of the longest palindromic subsequence of S.

Expected Time Complexity: O(|S|*|S|).
Expected Auxiliary Space: O(|S|*|S|).

1 ≤ |S| ≤ 1000

We are replacing the old Disqus forum with the new Discussions section given below.
Click here to view old Disqus comments.

to report an issue on this page.


We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?


All Submissions

My Submissions:

Login to access your submissions.

Longest Palindromic Subsequence

Output Window