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On an infinite number line (x-axis), we drop given squares in the order they are given. The i-th square dropped (positions[i] = (left, side_length)) i 阅读全文
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We are stacking blocks to form a pyramid. Each block has a color which is a one letter string, like `'Z'`. For every block of color `C` we place not i 阅读全文
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We are given N different types of stickers. Each sticker has a lowercase English word on it. You would like to spell out the given target string by cu 阅读全文
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We are given an elevation map, heights[i] representing the height of the terrain at that index. The width at each index is 1. After V units of water f 阅读全文
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You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go left or right. During t 阅读全文
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In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to max 阅读全文
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There is a box protected by a password. The password is n digits, where each letter can be one of the first k digits 0, 1, ..., k-1. You can keep inpu 阅读全文
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You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rota 阅读全文
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In this problem, a rooted tree is a directed graph such that, there is exactly one node (the root) for which all other nodes are descendants of this n 阅读全文
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Given a start IP address ip and a number of ips we need to cover n, return a representation of the range as a list (of smallest possible length) of CI 阅读全文
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Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the grid that form an axis- 阅读全文
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A virus is spreading rapidly, and your task is to quarantine the infected area by installing walls. The world is modeled as a 2-D array of cells, wher 阅读全文
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You have N bulbs in a row numbered from 1 to N. Initially, all the bulbs are turned off. We turn on exactly one bulb everyday until all bulbs are on a 阅读全文
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Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete th 阅读全文
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You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, )to get the value of 24. E 阅读全文
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In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as 阅读全文
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You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacl 阅读全文
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Nearly everyone has used the Multiplication Table. The multiplication table of size m x n is an integer matrix mat where mat[i][j] == i * j (1-indexed 阅读全文
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On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y 阅读全文
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Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It will ret 阅读全文
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There is a strange printer with the following two special requirements: The printer can only print a sequence of the same character each time. At each 阅读全文
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使用Ubuntu的虚拟机时如果不能主机之间进行复制粘粘，会非常非常的不方便，所以我们需要安装vmware tools，使用如下的代码（注意第二句一定要有，不然还是不能复制粘贴）： 阅读全文
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在使用微信官方给的添加自定义菜单的示例代码： 可能会遇到如下的错误： 原因出在小程序的链接上，官方只是给了个例子教你如何添加小程序链接到菜单栏，但是这个小程序并不是归属于你的，所以错误提示说appid没有绑定，这里的appid是小程序的，当然没有和你的绑定，所以只要将这段整个删掉就好了： 阅读全文
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Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list t 阅读全文
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There are N network nodes, labelled 1 to N. Given times, a list of travel times as directededges times[i] = (u, v, w), where u is the source node, v i 阅读全文
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Start from integer 1, remove any integer that contains 9 such as 9, 19, 29... So now, you will have a new integer sequence: 1, 2, 3, 4, 5, 6, 7, 8, 10 阅读全文
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Given a binary tree where every node has a unique value, and a target key k, find the value of the nearest leaf node to target k in the tree. Here, ne 阅读全文
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In a N x N grid representing a field of cherries, each cell is one of three possible integers. 0 means the cell is empty, so you can pass through; 1 m 阅读全文
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在配置WebDriverAgent的时候，可能会遇到如下的错误： 2018-01-04 09:53:42.759370-0600 WebDriverAgentRunner-Runner[318:13300] +[CATransaction synchronize] called within tra 阅读全文
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Given an array A (index starts at 1) consisting of N integers: A1, A2, ..., AN and an integer B. The integer Bdenotes that from any place (suppose the 阅读全文
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Given an array nums of integers, you can perform operations on the array. In each operation, you pick any nums[i] and delete it to earn nums[i] points 阅读全文
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Given a list of daily temperatures, produce a list that, for each day in the input, tells you how many days you would have to wait until a warmer temp 阅读全文
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Given a non-negative integer N, find the largest number that is less than or equal to N with monotone increasing digits. (Recall that an integer has m 阅读全文
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Given two sentences words1, words2 (each represented as an array of strings), and a list of similar word pairs pairs, determine if two sentences are s 阅读全文
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You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as fol 阅读全文
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We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign r 阅读全文
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Given an array consisting of n integers, find the contiguous subarray whose length is greater than or equal to k that has the maximum average value. A 阅读全文
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Given two sentences words1, words2 (each represented as an array of strings), and a list of similar word pairs pairs, determine if two sentences are s 阅读全文
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Implement a MyCalendarThree class to store your events. A new event can always be added. Your class will have one method, book(int start, int end). Fo 阅读全文
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在使用python爬虫提取中文网页的内容，为了能正确显示中文的内容，在转为字符串时一定要声明编码为utf-8，否则无法正常显示中文，而是显示原编码的字符，并没有正确转换。比如下面这个简单的爬取百度页面的title的示例： 如果不在tostring函数中正确配置的话，会打印出： 而正确的应该是： 阅读全文
