You are given a string S containing lowercase English letters. Your task is to calculate the minimum number of letters that need to be removed in order to make it possible to build a palindrome from the remaining letters. When building the palindrome, you can rearrange the remaining letters in any way. A palindrome is a string that reads the same both forwards and backwards. Some examples of palindromes are: "kayak", "radar", "mom". Write a function: def solution(5) which, given a string of length
N
, returns the minimum number of letters that need to be removed. Examples: 1. Given
S
= "ervervige", your function should return 2. After removing the letter "
g
" and one "e", we may create a word "reviver", which is a palindrome. 2. Given
S
= "aaabab", your function should return 0 . We may create a word "aabbaa", which is a palindrome and uses all of the letters. delete any letter. Write an efficient algorithm for the following assumptions: -
N
is an integer within the range [1..200,000]: - S contains only lowercase English letters.

Question

14-11-2022
Engineering

contestada

You are given a string S containing lowercase English letters. Your task is to calculate the minimum number of letters that need to be removed in order to make it possible to build a palindrome from the remaining letters. When building the palindrome, you can rearrange the remaining letters in any way. A palindrome is a string that reads the same both forwards and backwards. Some examples of palindromes are: "kayak", "radar", "mom". Write a function: def solution(5) which, given a string of length
N
, returns the minimum number of letters that need to be removed. Examples: 1. Given
S
= "ervervige", your function should return 2. After removing the letter "
g
" and one "e", we may create a word "reviver", which is a palindrome. 2. Given
S
= "aaabab", your function should return 0 . We may create a word "aabbaa", which is a palindrome and uses all of the letters. delete any letter. Write an efficient algorithm for the following assumptions: -
N
is an integer within the range [1..200,000]: - S contains only lowercase English letters.

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tutorconsortium120 tutorconsortium120 · Answer 1 · 2022-11-20T08:14:21+01:00

A straightforward fix is to eliminate each subsequence one at a time and determine whether the remaining string is a palindrome or not. This solution has exponential time complexity.

What is palindrome?

A palindrome is a word, phrase, or sentence that reads the same both forward and backward. Palindrome is a combination of the Greek words for "again" (palin) and "to run" (drom).
Finding the length of the longest palindromic subsequence of a given sequence is a useful strategy.
Reverse a Word using Stack is the subject of this series of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs). 1. A word can be reversed using stack to determine whether or not it is a palindrome.
having the function in / If a palindromic string of at least three characters can be made by eliminating one or two characters, it can be created using the PalindromeCreator(str) function.

To learn more about palindrome refer to:

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