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

  Given an Iterator class interface with methods: next() and hasNext(), design and impleme…

  Given a non-empty string str and an integer k, rearrange the string such that the same characters are a…

  Design a data structure that supports all following operations in average O(1) time. &nb…

  Now you are given a string S, which represents a software license key which we would like to format. Th…

Palindrome Permutation Given a string, determine if a permutation of the string could form a palindrome. For e…

1. 题目 Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 对matrixi==…

  The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ..…

  Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node …

  S and T are strings composed of lowercase letters. In S, no letter occurs more than…

题目地址：https://leetcode-cn.com/probl…题目描述：在上次打劫完一条街道之后和一圈房屋后，小偷又发现了一个新的可行窃的地区。这个地区只有一个入口，我们称之为“根”。 除了“根”之外…

  Given a string containing just the characters '(' and ')', find the length of the longes…