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Palindrome String

Last Updated : 13 Mar, 2023
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A palindrome is a word, phrase, number, or sequence of characters that reads the same backward as forward.

In other words, if you reverse the order of its characters, you get the same string. For example, “racecar” is a palindrome because if you reverse the order of the characters, you get “racecar” again.

Properties of a Palindrome:

  • Palindromes have a symmetrical structure which means that the characters in the first half of the string are the same as the characters in the second half but in reverse order.
  • Palindromes can be made up of any type of character, including letters, numbers, and symbols.
  • Palindromes can be of any length, from a single character to an entire sentence or paragraph.

How to identify a Palindrome?

To identify whether a string is a palindrome, you can follow these steps:

  • Remove all non-alphanumeric characters from the string and convert it to lowercase or uppercase. 
    • This step is optional, depending on whether you consider non-alphanumeric characters and case sensitivity when identifying palindromes.
  • Compare the first and last characters of the string. If they are the same, move on to the second and second-to-last characters, and so on, until you have compared all pairs of characters in the string.
  • If all pairs of characters match, then the string is a palindrome. Otherwise, it is not.

To find out the implementation, refer to this article.

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