286. Walls and Gates — Walls and Gates You are given an m x n grid rooms initialized with these three possible values. -1 A wall or an obstacle. 0 A gate. INF Infinity means an empty room. We use the value 231 - 1 = 2147483647 to represent INF as you may assume that…

all meetings problems on leetcode Meeting Room Meeting Rooms Given an array of meeting time intervals where intervals[i] = [starti, endi], determine if a person could attend all meetings. Example 1: Input: intervals = [[0,30],[5,10],[15,20]] Output: false Example 2: Input: intervals = [[7,10],[2,4]] Output: true Constraints: 0 <= intervals.length <= 104 intervals[i].length…

All problems below are about the intervals. 56. Merge Intervals Merge Intervals — LeetCode Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input. Example 1: Input: intervals = [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]] Explanation: Since intervals…

1231. Divide Chocolate — Account Login — LeetCode **** It is recommended that you checkout **410. Split Array Largest Sum **problem first. The only difference is that this problem we are finding a sum of subarray whose value is as smaller as possible. class Solution { public: int maximizeSweetness(vector<int>& sweetness, int k)…

1539. Kth Missing Positive Number — Kth Missing Positive Number — LeetCode **** Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Find the kth positive integer that is missing from this array. Example 1 Input: arr = [2,3,4,7,11], k = 5 Output: 9 Explanation: The missing positive integers are…

This pattern describes an interesting approach to deal with problems involving arrays containing numbers in a given range. For example, take the following problem: You are given an unsorted array containing `n` numbers taken from the range `1` to `n`. The array can have duplicates, which means that some numbers…

Menu Only 算是 Cocoa App 中最常见的一项，它使得 App 不占用你的 Dock 栏，在多 workspace 的时候也不影响正常使用，随时都可以在屏幕的菜单栏中执行快捷操作。尤其是针对一些需要便捷性要求比较高的应用来讲，Menu bar 的功能必不可少。本文就简单介绍一下关于 Menu App 中关键的几个开发步骤。 介绍 以 Shim …

因为 Evernote 在国内使用了不同的账户体系，去年团队也彻底独立出来，但是 Safari 的剪藏插件是同一个下载地址，但是当你系统是英文系统的时候，使用 Safari 剪藏有点尴尬，就是根本找不到印象笔记的登录入口，该文做个记录。 首先 Safari 默认是没有 Develop 菜单的，因此先开启 Develop 模式，进入 Safari 的选项设置面板中，最后 Advanced 选项卡最下方如图勾选。 此时，在 Safari 的顶部菜单中会多出 Develop 菜单入口，如下图所示：

记录一下自己常用的 Mac Apps，每次重装之后到了用的时候发现忘记安装了(不是每次都用 TimeMachine 恢复) 办公工具 离开这些工具，貌似无法办公的。 AirMail 下载地址