VALID PALINDROME | Leet Code |#cfam #leetcode #leetcode125

Leetcode Problem Solution For Problem 125 using Python Code. Here is the description of the code, how it works.
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The code defines a class called Solution with a method named isPalindrome. The purpose of this method is to determine whether a given string s is a palindrome or not. A palindrome is a sequence of characters that reads the same forward as backward, ignoring spaces, punctuation, and capitalization.
Now, let's dissect each part of the code:
1. Class Definition:
Here, a class named Solution is defined. Classes in Python are used to bundle data and functionality together. In this case, the class is serving as a container for a solution to a specific problem.

2. Method Definition:
Inside the Solution class, there is a method named isPalindrome. This method takes a string s as input and returns a boolean (True or False) indicating whether the input string is a palindrome.

3. Removing Non-Alphanumeric Characters:

4. Converting to Lowercase:
After removing non-alphanumeric characters, this line converts all the characters in the string s to lowercase using the lower() method. This step is taken to make the palindrome check case-insensitive. It ensures that uppercase and lowercase letters are treated as the same during the palindrome comparison.

5. Palindrome Check:
Finally, the method checks if the modified string s is equal to its reverse. The expression s[:] creates a copy of the string, and s[::-1] reverses the string. If the reversed string is the same as the original string, the method returns True, indicating that the input string is a palindrome. Otherwise, it returns False.

How the Code Works:
Input Sanitization:

Non-alphanumeric characters are removed.
The string is converted to lowercase.
Palindrome Check:

The modified string is compared to its reverse to determine if it reads the same forward and backward.

Example:
Let's go through an example to illustrate how the code works:
The input string is "A man, a plan, a canal: Panama".
Non-alphanumeric characters are removed, resulting in "amanaplanacanalPanama".
The string is converted to lowercase, resulting in "amanaplanacanalpanama".
The string is compared to its reverse, and since they are the same, the result is True.
Summary:
In summary, the provided code defines a class with a method to check if a given string is a palindrome. It does this by removing non-alphanumeric characters, converting the string to lowercase, and then comparing it to its reverse. The approach ensures that the palindrome check is case-insensitive and ignores non-alphanumeric characters, providing a more flexible and accurate palindrome determination.
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