题目

Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.

Example:

Input: [-2,1,-3,4,-1,2,1,-5,4],
Output: 6
Explanation: [4,-1,2,1] has the largest sum = 6.
Follow up:

If you have figured out the O(n) solution, try coding another solution using the divide and conquer approach, which is more subtle.

Hazel是一款轻量级的Electron 程序更新服务器，可以在Now上免费部署。它会自动从GitHub Releases中拉取更新文件，并且利用 GitHub CDN 的强大性能，下载很快。

Electron是一款可以使用 JavaScript，HTML 和 CSS构建跨平台桌面应用的框架。但是当用户获取下一个版本的时候，只能下载重新安装一遍下一个版本，十分僵硬，于是我们需要引入一个Electron自动更新的方法。

有多种方法可以更新Electron应用. 最简单并且获得官方支持的方法是利用内置的Squirrel框架和Electron的autoUpdater模块。但是目前autoUpdater只有 macOS 和 Window 支持该功能。在 Linux 上没有对自动更新程序的内置支持。

然而，各种谷歌到的官方文档和博客实在是太坑，感觉讲的都不是很详细，我这里记录汇总并加点自己的观点。

这篇文章转自我室友，发生在他带妹去墨西哥旅游的时候，当时处境十分窘迫。我还没去过墨西哥，但是听他描述墨西哥貌似警匪一家，对外地游客十分不友好，感觉记录一下还是很有必要的，难说我去的时候就用到了（希望用不到，毕竟比他精

一般网页都可以直接使用bootstrap和JQuery 的CDN来请求bootstrap和JQuery。但是做electron应用的时候希望做成本地的，因为不是每时每刻都可以联网。原以为 npm 安装之后直接用就可以，结果遇到了很多坑，这里记录下。

题目

The Hamming distance between two integers is the number of positions at which the corresponding bits are different.

Given two integers x and y, calculate the Hamming distance.

Note:
0 ≤ x, y < 2^31 .

Example:

Input: x = 1, y = 4

Output: 2

Explanation:

1
2
3

1   (0 0 0 1)    
4   (0 1 0 0)    
       ↑   ↑

The above arrows point to positions where the corresponding bits are different.

题目

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string “”.

Example 1:

Input: [“flower”,”flow”,”flight”]
Output: “fl”

Example 2:

Input: [“dog”,”racecar”,”car”]
Output: “”

Explanation: There is no common prefix among the input strings.
Note:

All given inputs are in lowercase letters a-z.

题目

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

Example:

Given a = 1 and b = 2, return 3.

题目

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.

The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.

You may assume that each input would have exactly one solution and you may not use the same element twice.

Input: numbers={2, 7, 11, 15}, target=9
Output: index1=1, index2=2

转自Programmer Competency Matrix

注意:每个层次的知识都是渐增的，位于层次n，也蕴涵了你需了解所有低于层次n的知识。

计算机科学 Computer Science

Working with someone who has a good topcoder ranking would be an unbelievable piece of luck!

有一个黑客排行榜排名靠前的同事将会是一件无比幸运的事情。