Given a string of size ‘n’. The task is to remove or delete minimum number of characters from the string so that the resultant string is palindrome.
Note: The order of characters should be maintained.
Input : aebcbda Output : 2 Remove characters 'e' and 'd' Resultant string will be 'abcba' which is a palindromic string Input : geeksforgeeks Output : 8
A simple solution is to remove all subsequences one by one and check if remaining string is palindrome or not. Time complexity of this solution is exponential.
An efficient approach uses the concept of finding the length of the longest palindromic subsequence of a given sequence.
-->str is the given string. -->n length of str -->len be the length of the longest palindromic subsequence of str -->// minimum number of deletions min = n - len
Minimum number of deletions = 8
Time Complexity : O(n2)
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- Minimum number of deletions to make a string palindrome | Set 2
- Minimum number of characters to be replaced to make a given string Palindrome
- Minimum number of Appends needed to make a string palindrome
- Minimum number of deletions to make a sorted sequence
- Minimum number of deletions and insertions to transform one string into another
- Minimum characters to be added at front to make string palindrome
- Number of Counterclockwise shifts to make a string palindrome
- Minimum deletions from string to reduce it to string with at most 2 unique characters
- Minimum number of deletions so that no two consecutive are same
- Minimum number of characters to be removed to make a binary string alternate
- Minimum removal to make palindrome permutation
- Remove a character from a string to make it a palindrome
- Minimum changes required to make first string substring of second string
- Minimum cost to convert string into palindrome
- Minimum reduce operations to covert a given string into a palindrome
Improved By : nitin mittal