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C++中怎么删除vector中的一个元素

2023-07-19 20:36:56
TAG: cto to ec vector
共6条回复
LocCloud

C++ vector中实际删除元素使用的是容器vecrot中std::vector::erase()方法。

C++ 中std::remove()并不删除元素,因为容器的size()没有变化,只是元素的替换。

代码:std::vector::erase()函数原型:iterator erase (iterator position);  //删除指定元素

iterator erase (iterator first, iterator last);  //删除指定范围内的元素返回值:指向删除元素(或范围)的下一个元素。

positions.erase(positions.begin() + i)

注意删除之后vector大小已经变化, 循环控制条件要注意变化

c.pop_back

c的最后一个元素,返回void。

扩展资料:

C++是C语言的继承,它既可以进行C语言的过程化程序设计,又可以进行以抽象数据类型为特点的基于对象的程序设计,还可以进行以继承和多态为特点的面向对象的程序设计。

C++擅长面向对象程序设计的同时,还可以进行基于过程的程序设计,因而C++就适应的问题规模而论,大小由之。

C++语言中定义了丰富的运算符,如算术运算符、关系运算符、逻辑运算符等等,有些运算符需要两个操作数,使用形式为

<操作数1>运算符<操作数2>

这样的运算符称为二元运算符(或二目运算符)。另一些运算符只需要一个操作数,称为一元运算符(或单目运算符)。

运算符具有优先级与结合性。当一个表达式包含多个运算符时,先进行优先级高的运算,再进行优先级低的运算。

参考资料来源:百度百科-c++

牛云

方法如下:

(1)public final synchronized void removeElement(Object obj)

从向量中删除obj。若有多个存在,则从向量头开始试,删除找到的第一个与obj相同的向量成员。

(2)public final synchronized void removeAllElement()

删除向量中所有的对象。

(3)public final synchronized void removeElementlAt(int index)

删除index所指的地方的对象。

Vector类 是在 java 中可以实现自动增长的对象数组,vector在C++标准模板库中的部分内容,它是一个多功能的,能够操作多种数据结构和算法的模板类和函数库。

positions

扩展资料

vector的查询搜索功能

(1)public final int indexOf(Object obj)

从向量头开始搜索obj,返回所遇到的第一个obj对应的下标,若不存在此obj,返回-1。

(2)public final synchronized int indexOf(Object obj,int index)

从index所表示的下标处开始搜索obj。

(3)public final int lastIndexOf(Object obj)

从向量尾部开始逆向搜索obj。

(4)public final synchronized int lastIndexOf(Object obj,int index)

从index所表示的下标处由尾至头逆向搜索obj。

(5)public final synchronized Object firstElement()

获取向量对象中的首个obj。

(6)public final synchronized Object lastElement()

获取向量对象中的最后一个obj。

参考资料:百度百科——vector

LuckySXyd

#include <vector>

using namespace std;

void main(void)

{

vector<int> array;

array.push_back(1);

array.push_back(2);

array.push_back(3);

array.push_back(4);

array.push_back(5);

vector<int>::iterator itr = array.begin();

while (itr != array.end)

{

if (*itr == 3)array.erase(itr);//删除值为3的元素

++itr;

}

}

//若是最后一个可用array.pop_back()

瑞瑞爱吃桃

#include <vector>

using namespace std;

void main(void)

{

vector<int> array;

array.push_back(1);

array.push_back(2);

array.push_back(3);

array.push_back(4);

array.push_back(5);

vector<int>::iterator itr = array.begin();

while (itr != array.end)

{

if (*itr == 3)array.erase(itr);//删除值为3的元素

++itr;

}

}

//若是最后一个可用array.pop_back()

南yi

std::vector<int> example;

for(int i=0;ⅰ<10;ⅰ++){

example.push_back(i);

}

//假如要删除第5个元素

example.erase(example.begin()+5);

大鱼炖火锅

Removes an element or a range of elements in a vector from specified positions.

iterator erase(

iterator _Where

);

iterator erase(

iterator _First,

iterator _Last

);

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2023-07-19 13:53:213

此句成分分析,及翻译详细点谢谢大家!

TOM is responsible for interviewing applicants for some of the positions with her company这句话要分tom是男人,tom是女人还分析。主要是company 的意思tom是女人:tom负责面试申请他们公司一些职位的求职者。那么with就有问题,应该改为in。tom是男人:tom 和她一起负责面试申请他们公司一些职位的求职者。如果with没用错的话,tom应该是个男人。
2023-07-19 13:53:282

S2SH框架中,action中使用实体类.setXX();报空指针

2023-07-19 13:53:377

android怎么用paint实现图像的渐变出现

在android.graphics中提供了有关Gradient字样的类,例如LinearGradient线性渐变、 RadialGradient径向渐变和SweepGradient角度渐变三种,他们的基类为android.graphics.Shader。为了演 示图像渐变效果,下面给出一个简单的实例。一、LinearGradient线性渐变在android平台中提供了两种重载方式来实例化该类分别为,他们的不同之处为参数中第一种方法可以用颜色数组,和位置来实现更细腻的过渡效果, 比如颜 色采样int[] colors数组中存放20种颜色,则渐变将会逐一处理。而第二种方法参数仅为起初颜色color0和最终颜色color1。LinearGradient(float x0, float y0, float x1, float y1, int[] colors, float[] positions, Shader.TileMode tile)LinearGradient(float x0, float y0, float x1, float y1, int color0, int color1, Shader.TileMode tile)使用实例如下:Paint p=new Paint();LinearGradient lg=new LinearGradient(0,0,100,100,Color.RED,Color.BLUE,Shader.TileMode.MIRROR); //参数一为渐变起初点坐标x位置,参数二为y轴位置,参数三和四分辨对应渐变终点,最后参数为平铺方式,这里设置为镜像刚才已经讲到Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变,代码如下:p.setShader(lg);canvas.drawCicle(0,0,200,p); //参数3为画圆的半径,类型为float型。二、RadialGradient镜像渐变有了上面的基础,我们一起来了解下径向渐变。和上面参数唯一不同的是,径向渐变第三个参数是半径,其他的和线性渐变相同。RadialGradient(float x, float y, float radius, int[] colors, float[] positions, Shader.TileMode tile)RadialGradient(float x, float y, float radius, int color0, int color1, Shader.TileMode tile)三、SweepGradient角度渐变对于一些3D立体效果的渐变可以尝试用角度渐变来完成一个圆锥形,相对来说比上面更简单,前两个参数为中心点,然后通过载入的颜色来平均的渐变渲染。SweepGradient(float cx, float cy, int[] colors, float[] positions) //对于最后一个参数SDK上的描述为May be NULL. The relative position of each corresponding color in the colors array, beginning with 0 and ending with 1.0. If the values are not monotonic, the drawing may produce unexpected results. If positions is NULL, then the colors are automatically spaced evenly.,所以建议使用下面的重载方法,本方法一般为NULL即可。SweepGradient(float cx, float cy, int color0, int color1)到此,希望大家对图像特效处理有了一定的认识,了解这些对打好Android游戏开发的基础很有好处。
2023-07-19 13:53:534

语法:People keep themselves involved in intensely hard work in order to preserve their positions

是某人怎么样。这句话是,人们是他们自己投入到工作中
2023-07-19 13:54:033

mega建树时select codon positions是什么意思

select codon positions选择密码子位置select codon positions选择密码子位置
2023-07-19 13:54:101

Placement 同internship有咩分别??

Field placement: is a mandatory work experience ponent of a program. The student receives academic credit and the work terms are usually unpaid. Field placement positions must be related to the student"s area of study and are approved and monitored by program faculty. Field placements vary in length depending on program requirements. Internship: is an optional work experience program in which the student may be hired for 4 12 or 16 months prior to his or her final year of study. The student petes for the positions much the same as in a regular job petition. Internship positions must be related to the student"s area of study. The student is paid for their work during an internship. Once the internship is pleted the student returns to the college to plete his or her program of study. The internship is also noted on the student"s official academic trcript. The internship program is anized by Career & Employment Services. hope this can help you ^^ Good Luck la 参考: durhamcollege.ca/EN/main/current_students/18076/ac_23 Placement: 1the act of finding a place for someone to live or work: The centre provides ajob placement service. 2 a job usually as part of a course of study which gives you experience of a particular type of work : Students are sent out on placement for training. 3when something is placed somewhere or when you decide where something should go: the placement of fire hydrants along the city"s streets internship: 1a job that lasts for a short time that someone especially a student does in order to gain experience 2 a job that someone who has nearly finished training as a doctor does in a hospital 参考: longman dictionary
2023-07-19 13:54:171

如何选中其他程序ListView控件中的某个Item

一:程序说明:题目是一位网友在我留言板上的留言,不知道大家看没看过我曾经写过的《如何向其他程序的ListView控件发送LVM_GETITEMTEXT消息》一文?在那篇拙文中,我的目的是得到某一Item的TEXT。于是我将LVITEM结构插入到了目标进程中,才使得目标进程正确响应LVM_GETITEMTEXT消息。要得到某一Item的TEXT,需要发送LVM_GETITEMTEXT消息,而要选中某个Item则要发送LVM_SETITEMSTATE消息:LVM_GETITEMTEXTwParam = (WPARAM) (int) iItem;lParam = (LPARAM) (LV_ITEM FAR *) pitem;LVM_SETITEMSTATEwParam = (WPARAM) (int) i;lParam = (LPARAM) (LV_ITEM FAR *) pitem;看到了吗?两个消息的参数一模一样!再来看看LV_ITEM结构的设置:只需将state和stateMask设置成LVIS_SELECTED,并指定iItem即可。直接修改上篇拙文中的代码就能轻松搞定本篇要解决的问题作为演示,下面的这段程序将选中TaskManager中第6个项目。二:具体实践:/* * Send LVM_SETITEMSTATE * 版权所有 (C) 2005 天津 赵春生 * 2005.08.04 * http://timw.yeah.net * http://timw.126.com * 本程序适用于:Win2KP+SP4[Windows TaskManager(5.0.2195.6620)] * WinXP+SP1[Windows TaskManager] * 代码在Win2000P+SP4 + VC6+SP6测试通过*/#include< windows.h >#include< commctrl.h >int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWND hwnd; int iItem=0; LVITEM lvitem, *plvitem; DWORD PID; HANDLE hProcess;hwnd=FindWindow("#32770","Windows 任务管理器"); hwnd=FindWindowEx(hwnd,0,"#32770",0); hwnd=FindWindowEx(hwnd,0,"SysListView32",0); if (!hwnd) MessageBox(NULL,"[Windows 任务管理器] 尚未启动!","错误!",NULL); else { GetWindowThreadProcessId(hwnd, &PID); hProcess=OpenProcess(PROCESS_ALL_ACCESS,false,PID); if (!hProcess) MessageBox(NULL,"获取进程句柄操作失败!","错误!",NULL); else { plvitem=(LVITEM*)VirtualAllocEx(hProcess, NULL, sizeof(LVITEM), MEM_COMMIT, PAGE_READWRITE); if (!plvitem) MessageBox(NULL,"无法分配内存!","错误!",NULL); else { MessageBox(NULL,"本演示程序将选中TaskManager中的第6个项目。","提示",NULL); iItem=5;//5在这里是第六个(从零开始) lvitem.state=LVIS_SELECTED; lvitem.stateMask=LVIS_SELECTED; WriteProcessMemory(hProcess, plvitem, &lvitem, sizeof(LVITEM), NULL); SendMessage(hwnd, LVM_SETITEMSTATE, (WPARAM)iItem, (LPARAM)plvitem); } } } //释放内存 CloseHandle(hwnd); CloseHandle(hProcess); VirtualFreeEx(hProcess, plvitem, 0, MEM_RELEASE); return 0;}
2023-07-19 13:49:141

Oasis的《Supersonic》 歌词

歌曲名:Supersonic歌手:Oasis专辑:Stop The Clocks: Definitive CollectionI need to be myselfI can"t be no one elseI"m feeling supersonicGive me gin and tonicYou can have it all but how much do you want itYou make me laughGive me your autographCan I ride with you in your B.M.WYou can sail with me in my yellow submarineYou need to find out"Cos no one"s gonna tell you what I"m on aboutYou need to find a way for what you want to sayBut before tomorrow"Cos my friend said he"d take you homeHe sitted in a corner all aloneHe lives under a waterfallNo body can see himNo body can ever hear him callYou need to be yourselfYou can"t be no one elseI know a girl called ElsaShe"s into Alka SeltzerShe sniffs it through a cane on a supersonic trainAnd she makes me laughI got her autographShe`s done it with a doctor on a helicopterShe"s sniffin in her tissueSelling the Big IssueWhen she found outNo one"s gonna tell you what I"m on aboutYou need to find a way for what you want to sayBut before tomorrow"Cos my friend said he"d take you homeHe sitted in a corner all aloneHe lives under a waterfallNo body can see himNo body can ever hear him callhttp://music.baidu.com/song/1041216
2023-07-19 13:49:171

消毒柜英文怎么说

消毒柜Sterilizer或Sterilizing Cabinet
2023-07-19 13:49:176

推动什么大落实大兴调查研究之风

推动思想大解放、能力大提升、作风大转变、工作大落实,大兴调查研究之风。资料扩展:加强调查研究,推动思想大解放、能力大提升、作风大转变、工作大落实,要大兴调查研究之风,深入了解群众需求,切实解决广大百姓关心关切的利益问题,不断提高人民群众的获得感、幸福感、安全感。对加强调查研究、深入开展主题教育作出重要指示,极大鼓舞河北第一批开展主题教育单位广大党员干部。扎实开展学习贯彻新时代中国特色社会主义思想主题教育,紧紧围绕中心大局,坚持问题导向,搞好调查研究,形成更多解难题促发展的办法举措。只有全面深入的调查研究,才能解决实际存在的问题。为摸清企业数字化建设现状,找准数字化助力企业高质量发展的重点和方向,省工信厅加强对传统产业数字化转型的调查研究,在石家庄、张家口、秦皇岛等市开展蹲点调研,面向全省制造业企业开展网络调研。加快推动新一代信息技术与制造业深度融合,加快构建完善全省工业互联网网络、标识、平台、数据、安全等生态体系,提升基础设施水平,加速推进制造业数字化、网络化、智能化转型,为我省工业经济高质量发展提供有力支撑。聚焦向海洋转身、向绿色转型、向高质量转变,三友集团将调查研究与推动高质量发展有机结合。为企业解决问题、正确决策指明了路径。三友集团总工程师马德春介绍,前不久他带队到集团下属的10万吨电池级碳酸钠等海洋化工项目建设现场进行调研,接下来将继续结合集团谋划的100余项调研课题开展调查研究,探索海洋资源开发新途径,进一步助力临港产业强省建设。
2023-07-19 13:49:181

大兴调查之风是什么意思

大兴调查之风是指毛泽东倡导和身体力行的大规模调查研究活动。在全党大兴调查研究之风,要深入实际、实事求是。
2023-07-19 13:49:122

用一般将来时写一篇作文,题目是我的周末计划,50词,英语的,谢谢

In this weekend, I have a plan, if tomorrow is a sunny day。 Saturday morning, I am going to visit my grandparents。after lunch I have good friends and I go to the movies and football. At night, I can stay home and watch cartoons。 Sunday, I will go fishing with dad. After that I will go home to do my homework。 I hope this weekend I can live very happy!
2023-07-19 13:49:101

Sonic Syndicate - Enclave歌词翻译

我们不请自来 到这个忧郁的世界你不停地学习唯一值得珍惜人们对现实的看法那么为什么还有泪水在你的眼睛?所以我想教你的东西我却让你失望离去所以我想为你指出路但是使你走入歧途我要跨七海我只是想要了解你我不会睡眠一千夜给什么属于你你是我的令牌这个交易使我逃脱看到一个新的地平线在海洋深处的水但是海浪河将永远记得永远是不够长的组成了你永远我的心将永远牢记你的名字
2023-07-19 13:49:092