Subs

访问所有点的最小时间 不难看出，从点(x1,y1) 到 (x2,y2) 的步数需要 min(dx,dy) ,其中 dx = abs(x1-x2) , dy = abs(y1-y2) class Solution { public: int minTimeToVisitAllPoints(vector<vector<int>>& points) { int ans(0); int x = points[0][0],y = points[0][1]; for(int i = 1,sz = points.size();i < sz;++i){ ans += dis(x,y,points[i][0],points[i][1]); x = points[i][0],y = points[i][1]; } return ans; } int dis(int x,int y,int x2,int y2){ return max(abs(x-x2),abs(y-y2)); } }; 统计参与通信的服务器 题意：给你一个 01 矩阵，求其中哪些 1 所在的行、列和大于1 class Solution { public: int countServers(vector<vector<int>>& grid) { int n = grid.size(), m = grid[0].size(); bool

new Vue后: Vue.prototype._init= function(...){ 　　initLifecycle(vm) //初始化生命周期 　　initEvents(vm) //初始化事件中心 　　initRender(vm) //初始化渲染 　　initState(vm) //初始化状态 } function initState(){ 　　vm._watchers= [] //所有watcher 　　const opts= vm.$options 　　initProps() 　　initMethods() 　　initData()//先初始化data中的属性 　　initComputed(vm, opts.computed) //初始化computed属性 　　initWatch() } const computedWatcherOptions= {computed: true} function initComputed(vm, computed){ 　　const watchers= vm._computedWatchers= Object.create(null) //所有computed属性 　　for(const key in computed){ 　　　　const userDef= computed[key] //computed属性定义

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a few blocks of code, inside a function of some object, that can run in parallel and speed things up for me. I tried using subs::parallel in the following way (all of this is in a body of a function): my $is_a_done = parallelize { # block a, do some work return 1; }; my $is_b_done = parallelize { # block b, do some work return 1; }; my $is_c_done = parallelize { # block c depends on a so let's wait (block) if ($is_a_done) { # do some work }; return 1; }; my $is_d_done = parallelize { # block d, do some work return 1; }; if ($is_a_done

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: For example, in this simple/stupid example: n = 3; x = zeros(n, 1); for ix=1:4 x(ix) = ix; end the array is pre-allocated, but dynamically resized in the loop. Is there a setting in Matlab that will throw an error when dynamic resizing like this occurs? In this example I could trivially rewrite it: n = 3; x = zeros(n, 1); for ix=1:4 if ix > n error('Size:Dynamic', 'Dynamic resizing will occur.') end x(ix) = ix; end but I'm hoping to use this as a check to make sure I've pre-allocated my matrices properly. 回答1: You can create a subclass of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Trying to get www.example.com to go directly to www.example.com/store I have tried multiple bits of code and none work. What I've tried: Options +FollowSymlinks RewriteEngine on RewriteCond %{HTTP_HOST} ^example.com$ RewriteRule (.*) http://www.example.com/$1 [R=301,L] RewriteCond %{HTTP_HOST} ^(.+)\www.example\.com$ RewriteRule ^/(.*)$ /samle/%1/$1 [L] What am I doing wrong? 回答1: You can use a rewrite rule that uses ^$ to represent the root and rewrite that to your /store directory, like this: RewriteEngine On RewriteRule ^$ /store [L] 回答2:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: As I understand it, a field length of a given document is the number of terms indexed in the field of the given document. However, it seems that the field length is never an integer. For instance, I've seen a document with two terms in its content field, but the content field length as calculated by Solr is actually 2.56, not 2 as I've expected. How is a field length really being calculated in Solr/Lucene? I'm referring to the field length as it is used when calculating the score according to the BM25 similarity function, but I think that

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm newbie in JavaScript, i hope you can help me, as in topic, null property. var add = document.getElementById('addition').checked; var subs = document.getElementById('substraction').checked; var multi = document.getElementById('multiplication').checked; var div = document.getElementById('division').checked; var result = 0; var x = parseInt(document.getElementById('firstNumber').value); var y = parseInt(document.getElementById('secondNumber').value); function calculator() { if (add) { result = addition(x, y); } else if (subs) { result =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In an expression like import sympy a = sympy.Symbol('a') b = sympy.Symbol('b') x = a + 2*b I'd like to swap a and b to retrieve b + 2*a . I tried y = x.subs([(a, b), (b, a)]) y = x.subs({a: b, b: a}) but neither works; the result is 3*a in both cases as b , for some reason, gets replaced first. Any hints? 回答1: There is a simultaneous argument you can pass to the substitution, which will ensure that all substitutions happen simultaneously and don't interfere with one another as they are doing now. y = x.subs({a:b, b:a}, simultaneous=True)

git log --author="username" --since=2018-01-01 --until=2019-12-31 --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %s\n", add, subs, loc }' - 2.查看提交者排名前N位 git log --pretty='%aN' | sort | uniq -c | sort -k1 -n -r | head -n 5 3.提交数统计 git log --oneline | wc -l 4.根据用户名统计 git log --author="username" --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %s\n", add, subs, loc }' - git log --since=2018-01-01 --until=2018-12-31

本文转载于: 猿2048 网站➺ Vue中最常用到的 API 之一 computed 的实现原理 虽然目前的技术栈已由 Vue 转到了 React，但从之前使用 Vue 开发的多个项目实际经历来看还是非常愉悦的，Vue 文档清晰规范，api 设计简洁高效，对前端开发人员友好，上手快，甚至个人认为在很多场景使用 Vue 比React 开发效率更高，之前也有断断续续研读过 Vue 的源码，但一直没有梳理总结，所以在此做一些技术归纳同时也加深自己对 Vue 的理解，那么今天要写的便是 Vue 中最常用到的 API 之一 computed 的实现原理。 基本介绍 话不多说，一个最基本的例子如下： {{fullName}} new Vue({ data: { firstName: 'Xiao', lastName: 'Ming' }, computed: { fullName: function () { return this.firstName + ' ' + this.lastName } } }) Vue 中我们不需要在 template 里面直接计算 {{this.firstName + ' ' + this.lastName}}，因为在模版中放入太多声明式的逻辑会让模板本身过重，尤其当在页面中使用大量复杂的逻辑表达式处理数据时，会对页面的可维护性造成很大的影响，而