Given a string containing only three types of characters: ‘(‘, ‘)’ and ‘*…

Encode and Decode Strings Design an algorithm to encode a list of strings to a string. The encoded string is t…

题目： A linked list is given such that each node contains an additional random pointer which could point to any …

Inorder Successor in BST Given a binary search tree and a node in it, find the in-order successor of that node…

1. 题目 Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If the…

  The thief has found himself a new place for his thievery again. There is only one entrance to this area…

  Implement a basic calculator to evaluate a simple expression string. The expression string may contain …

Course Schedule I There are a total of n courses you have to take, labeled from 0 to n – 1. Some courses…

Longest Substring Without Repeating Characters 最新更新解法：https://yanjia.me/zh/2018/12/… Given a string, fin…

  Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic …

  Design a data structure that supports all following operations in average O(1) time. Not…

  A string such as "word" contains the following abbreviations: ["word", "1ord", "w1rd", "wo1d"…