Posted on Mon 18 November 2024 in Leetcode • Tagged with set, fast-slow-pointer
Question Link : https://leetcode.com/problems/happy-number/
Difficulty: Easy
Premium: False
Write an algorithm to determine if a number n is happy. A happy number is a number defined by the following process:
Starting with any positive integer, replace the number by the sum of the squares of its …
Posted on Sun 04 December 2022 in Leetcode • Tagged with fast-slow-pointer
Question Link : https://leetcode.com/problems/middle-of-the-linked-list/
Difficulty: Easy
Premium: False
Given the head of a singly linked list, return the middle node of the linked list. If there are two middle nodes, return the second middle node. Example 1:
Input: head = [1,2,3,4,5] Output: [3 …
Posted on Sat 29 October 2022 in Leetcode • Tagged with palindrome-center-expansion, fast-slow-pointer
Question Link : https://leetcode.com/problems/palindrome-linked-list/
Difficulty: Easy
Given the head of a singly linked list, return true if it is a palindrome or false otherwise. Example 1:
Input: head = [1,2,2,1] Output: true
Example 2:
Input: head = [1,2] Output: false
Constraints:
The number of …
Posted on Thu 13 October 2022 in Leetcode • Tagged with fast-slow-pointer
Question Link : https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/
Difficulty: Medium
You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list. The middle node of a linked list of size n is the ⌊n / 2⌋th node from the …
Posted on Mon 07 March 2022 in Leetcode • Tagged with linked-list, fast-slow-pointer
Question Link : https://leetcode.com/problems/linked-list-cycle/
Difficulty: Easy
Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by …