Palindrome Linked List Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it…

1. 题目 Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of…

10. Regular Expression Matching 题目 Implement regular expression matching with support for '.' and '*'. '.' Mat…

  Given a binary tree, return the preorder traversal of its nodes’ values. For example:Gi…

  We define a harmonious array is an array where the difference between its maximum value and its minimum…

  If the depth of a tree is smaller than 5, then this tree can be represented by a list of three-dig…

  Given an array S of n integers, find three integers in S such that the su…

  There are N students in a class. Some of them are friends, while some are not. Their friendsh…

  Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest…

  Implement a MyCalendarTwo class to store your events. A new event can be added if adding the …

Binary Tree Level Order Traversal Given a binary tree, return the level order traversal of its nodes…

Search in Rotated Sorted Array I Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i…