81. Search in Rotated Sorted Array II 题目 Follow up for "Search in Rotated Sorted Array": What if duplicates ar…

71. Simplify Path 题目 Given an absolute path for a file (Unix-style), simplify it. For example, path = "/home/"…

  Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear …

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For ex…

本题考察的LRU缓存机制,HashMap和链表 题目描述 运用你所掌握的数据结构，设计和实现一个 LRU (最近最少使用) 缓存机制。它应该支持以下操作： 获取数据 get 和 写入数据 put 。 获取数据 get(k…

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-n…

题目 Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Gi…

  Given an input string (s) and a pattern (p), implement regular expression matching with support for&nbs…

  You are a product manager and currently leading a team to develop a new product. Unfortunately, the lat…

  Design a simplified version of Twitter where users can post tweets, follow/unfollow another user and is…

题目描述 Given an array with n objects colored red, white or blue, sort them so that objects of the same color are…

1. 题目 Given a list, rotate the list to the right by k places, where k is non-negative. For example:Given 1->…