There is a box protected by a password. The password is n digits, where each letter can be on…

Given an unsorted array of integers, find the length of longest increasing subsequence.Example: Input: [10,9,2…

Implement Trie Implement a trie with insert, search, and startsWith methods. Note: You may assume that all inp…

题目地址：https://leetcode-cn.com/probl…题目描述：将两个有序链表合并为一个新的有序链表并返回。新链表是通过拼接给定的两个链表的所有节点组成的。 解答：递归思想。若两者其中有一个为…

  Suppose we abstract our file system by a string in the following manner: The string "dir\n\tsubdir…

  There is a list of sorted integers from 1 to n. Starting from left to right, remove the first numb…

Minimum Size Subarray Sum Given an array of n positive integers and a positive integer s, find the minimal len…

53. Maximum Subarray 题目 Find the contiguous subarray within an array (containing at least one number) which ha…

  Given an array of integers, find out whether there are two distinct indices i and j in the array such t…

  Your are given an array of integers prices, for which the i-th element is the price of a give…

题目： Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree i…

  A message containing letters from A-Z is being encoded to numbers using the following mapping…