Palindrome Linked List Leetcode Solution

In the problem “Palindrome Linked List”, we have to check whether a given singly integer linked list is a palindrome or not. Example List = {1 -> 2 -> 3 -> 2 -> 1} true Explanation #1: The list is palindrome as all elements from the start and back are …

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Valid Palindrome Leetcode Solution

Problem Statement Given a string, we have to determine if it is a palindrome, considering only alphanumeric characters i.e. numbers and alphabets only. We also have to ignore cases for alphabet characters. Example “A man, a plan, a canal: Panama” true Explanation: “AmanaplanacanalPanama”  is a valid palindrome. “race a car” …

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Reverse Vowels of a String Leetcode Solution

Problem Statement In this problem a string is given and we have to reverse only the vowels of this string. Example “hello” “holle” Explanation: before reversing :  “hello” after reversing    :  “holle” “leetcode” “leotcede” Explanation: Approach 1 (Using Stack) We just have to reverse the vowels present in input …

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