elements

Why is a tuple of tuples of length 1 not actually a tuple unless I add a comma?

故事扮演 提交于 2020-06-23 08:15:30
问题 Given a tuple of tuples T : (('a', 'b')) and an individual tuple t1 : ('a','b') why does: t1 in T return False? UPDATE: From Ipython: In [22]: T = (('a','b')) In [23]: t1 = ('a','b') In [24]: t1 in T Out[24]: False And how then to check that a tuple is in another tuple? 回答1: The problem is because T is not a tuple of tuples, it is just a tuple. The comma makes a tuple, not the parentheses. Should be: >>> T = (('a','b'),) >>> t1 = ('a', 'b') >>> t1 in T True In fact, you can loose the outer

Remove Dynamic Element With Javascript [closed]

做~自己de王妃 提交于 2020-06-16 03:30:11
问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I make a form with dynamic elements with Javascript. I can add BUT I can't remove! I can't Solve Problem. I'm confused! :( My Code: <script type="text/javascript"> //+Element function addElement(div) { var ni = document.getElementById(div); var numi = document.getElementById('numVal

203. Remove Linked List Elements

风流意气都作罢 提交于 2020-04-05 15:31:33
Problem : Remove all elements from a linked list of integers that have value val. Example: Input: 1->2->6->3->4->5->6, val = 6 Output: 1->2->3->4->5 思路 : Solution (C++) : ListNode* removeElements(ListNode* head, int val) { ListNode dummyNode(0); using L = ListNode*; L dummy = &dummyNode, pre = dummy, cur = head; dummy->next = head; while (cur) { while (cur && cur->val == val) { cur = cur->next; pre->next = cur; } if (cur) { pre = cur; cur = cur->next; } } return dummy->next; } 性能 : Runtime: 44 ms  Memory Usage: 10.8 MB 思路 : Solution (C++) : 性能 : Runtime: ms  Memory Usage: MB 来源: https://www

Elements & MyVector 2016 4 8 homework

大城市里の小女人 提交于 2020-03-23 18:52:26
#include<iostream> #include<string> using namespace std; class Elements{ private: int value; static int numberOfObjects; public: Elements(); Elements(const int &value);//set value Elements(const Elements &elem); ~Elements();//descructor Elements & operator=(const Elements &elem);//assignment Elements & operator=(const int &value);//assignment friend istream& operator>>(istream& is, Elements & elem); //input one integer, and set the value friend ostream& operator<<(ostream& os, const Elements & elem); //output one integer to ostream void setValue(const int &value); //set value int getValue(

clone方法

本小妞迷上赌 提交于 2020-03-23 18:35:15
Object类里面有一个protected的clone对象,返回对象的副本,进行的浅拷贝,只是副本的字段引用原对象的字段引用的对象; 如果对象里面除了基本类型的字段和不可变对象,还有其他对象,那么这些其他的对象就要进行深拷贝; 以下是一个典型的重写clone方法的例子: class Person implements Cloneable {    int number;   String name;   String[] elements;    public Person clone() {     try {        Person person = (Person) super.clone();        person.elements = this.elements.clone();//进行了深拷贝        return person;      } catch (Exception ex) {       System.out.println("Test1的clone方法抛出异常。");        ex.printStackTrace();      }      return null;    } } 极少需要使用clone方法,而且,有更好的替代clone方法, 1、拷贝构造器 class Person {   int number;   

列表的内容依次切换显示

三世轮回 提交于 2020-03-21 16:59:54
效果:http://runjs.cn/code/cahcrllk <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>fade away</title> <style> #news{ position: relative; list-style: none; } #news li{ position: absolute; background: #dd93c2; } </style> </head> <body> <ul id="news"> <li>1<img src="image/3d/ps1.jpg"></li> <li>2<img src="image/3d/ps2.jpg"></li> <li>3<img src="image/3d/ps3.jpg"></li> <li>4<img src="image/3d/ps4.jpg"></li> </ul> <script src="js/jquery-1.11.3.js"></script> <script> var elements=$('#news').children(); for (var i = 0; i < elements.length; i++) { $(elements[i]).css('z-index', String

1001. Elements and MyVector 2016 4 8

时间秒杀一切 提交于 2020-03-21 01:43:27
#include<iostream> #include<string> using namespace std; class Elements{ private: int value; static int numberOfObjects; public: Elements(); Elements(const int &value);//set value Elements(const Elements &elem); ~Elements();//descructor Elements & operator=(const Elements &elem);//assignment Elements & operator=(const int &value);//assignment friend istream& operator>>(istream& is, Elements & elem); //input one integer, and set the value friend ostream& operator<<(ostream& os, const Elements & elem); //output one integer to ostream void setValue(const int &value); //set value int getValue(

小谈Jquery框架

◇◆丶佛笑我妖孽 提交于 2020-03-17 04:02:05
现在Jquery框架对于开发人员基本上是无人不知,无人不晓了,用起来十分的方便,特别是选择器十分强大,提高了我们的开发速度。但是好多人也只是停留在了会用的基础上,我个人觉得会用一个框架不算什么,只能说明你对那个框架比较熟悉,知道里面的思想和实现才是王道。有好多大牛对Jquery框架进行了剖析,今天我只是根据我的见解来分析一下。 一段代码如下: (function (win) { var _$ = function (selector, context) { return new _$.prototype.Init(selector, context); } _$.prototype = { Init: function (selector, context) { this.elements = []; var context = context || document; if (context.querySelectorAll) { var arr = context.querySelectorAll(selector); for (var i = 0; i < arr.length; i++) { this.elements.push(arr[i]); } } ////这一块是选择器的实现,没有写完,可以自己实现 }, each: function (callback) { if

C++ std::array

可紊 提交于 2020-03-05 08:04:18
std::array template < class T, size_t N > class array; Code Example #include <iostream> #include <array> #include <cstring> using namespace std; int main(int argc, char **argv) { array<int, 5> intArr = {1,2,3,4,5}; for(auto it = intArr.begin(); it != intArr.end(); it++ ) { cout << *it << "\t"; } ///< output: 1 2 3 4 5 cout << "\n"; ///< r means reverse for(auto rit = intArr.rbegin(); rit < intArr.rend(); rit++) { cout << *rit << "\t"; } ///< output: 5 4 3 2 1 cout << "\n"; ///< c means const for(auto cit = intArr.cbegin(); cit != intArr.cend(); cit++ ) { cout << *cit << "\t"; } ///< output:1 2

数据结构(第五章)

折月煮酒 提交于 2020-02-21 05:18:42
树下 第一讲 一.堆 什么是堆? 在讲堆之前,我们先看看什么是优先队列。 优先队列:是一种特殊的队列,从名称上看,优先,顾名思义,取出的元素是按照一定的优先级出队的,而不是元素进入队列的先后顺序。 优先队列的完全二叉树表示 堆的两个特性: 结构性 :用数组表示的完全二叉树。 有序性 :任一结点的关键字是其子树所有结点的最大值(或最小值)。 由最大值和最小值我们可以引出一个新概念“最大堆”“最小堆” 最大堆:每个结点的元素值不小于其子结点的元素值。 最小堆:每个结点的元素值不大于其子结点的元素值。 主要在最大堆的操作上面,因为最大堆会了,最小堆自然就不成问题了 最大堆的创建 typedef struct HeapStruct * MaxHeap ; struct HeapStruct { ElementType * Elements [ ] ; //存储堆元素 int Size ; //堆元素个数 int Capacity ; //堆的最大容量 } MaxHeap Create ( int MaxSize ) { MaxHeap H = malloc ( sizeof ( struct Heapstruct ) ) ; H -> Elements = malloc ( ( MaxSize + 1 ) * sizeof ( sizeof ( ElementType ) ) ; H ->