Palindrome Linked List: Given the head of a singly linked list, return true if it is a palindrome or false otherwise.
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Middle of the Linked List: Given the head of a singly linked list, return the middle node of the linked list.
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Reverse Linked List: Given the head of a singly linked list, reverse the list, and return the reversed list.
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Find Median from Data Stream: The median is the middle value in an ordered integer list.
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K Closest Points to Origin: Given an array of points where points[i] = [x_i, y_i] represents a point on the X-Y plane and an integer k, return the k closest points to the origin (0, 0).
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Best Time To Buy And Sell Stock: You are given an array prices where prices[i] is the price of a given stock on the ith day.
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