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206. Reverse Linked List  Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head = [1,2,3,4,5]Output: [5,4,3,2,1]Example 2: Input: head = [1,2]Output: [2,1]Example 3:Input: head = []Output: [] Constraints:The number of nodes in the list is the range [0, 5000].-5000  class Solution: def reverseList(self, head: Optional[ListNode]) -> Optio..

213. House Robber IIYou are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in a circle. That means the first house is the neighbor of the last one. Meanwhile, adjacent houses have a security system connected, and it will automatically contact the police if two adjacent houses were broken into on..

79. Word Search Given an m x n grid of characters board and a string word, return true if word exists in the grid.The word can be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. The same letter cell may not be used more than once. Example 1:Input: board = [["A","B","C","E"],["S","F","C","S"],["A","D","E","E"]], word = "ABC..