首页 \ 问答 \ 向量对通过对元素的差异进行排序(vector pair sorting by the difference of the pair elements)

向量对通过对元素的差异进行排序(vector pair sorting by the difference of the pair elements)

 在C ++中是否有任何方法，它会根据对值的差异对我进行一对向量排序。 举个例子，假设我有4对  
1 3, 
5 6, 
2 3,
12 5,
 
 所以，对的差异是2 1 1 7，如果我按降序排序排序的向量将是，  
12 5,
1 3,
5 6,
2 3,
 
 我希望你明白我的问题是什么。 有什么方法可以用这种方法对元素进行排序吗？  
 我试过这种方法来根据第一个或第二个元素对元素进行排序。 但这不是我的问题。 我的问题是我需要根据差异进行排序。  
bool sortinrev(const pair<int,int> &a, const pair<int,int> &b){
    return(a.first > b.first) ;
}


int main()
{
    vector< pair <int,int> > pq;
    for(int i=1; i<=4; i++){
        int x,y;
        cin >> x >> y;

        pq.push_back(make_pair(x,y));
    }

    sort(pq.begin(), pq.end(), sortinrev);

    for(int i=0; i<4; i++){
        cout << pq[i].first << " " << pq[i].second << endl;
    }


    return 0;
}

Is there any way in C++, That will sort me a pairs of vector based on the difference of the pair values. As an example, Suppose I have 4 pairs 
1 3, 
5 6, 
2 3,
12 5,
 
so, the differences of the pairs are 2 1 1 7, if I sort in descending order The sorted vector would be, 
12 5,
1 3,
5 6,
2 3,
 
I hope you understood what my problem is. Is there any way to sort the elements this way? 
I have tried this way to sort elements based on first or second element. But this is not my problem. My problem is I need sort that based on the difference. 
bool sortinrev(const pair<int,int> &a, const pair<int,int> &b){
    return(a.first > b.first) ;
}


int main()
{
    vector< pair <int,int> > pq;
    for(int i=1; i<=4; i++){
        int x,y;
        cin >> x >> y;

        pq.push_back(make_pair(x,y));
    }

    sort(pq.begin(), pq.end(), sortinrev);

    for(int i=0; i<4; i++){
        cout << pq[i].first << " " << pq[i].second << endl;
    }


    return 0;
}

原文：https://stackoverflow.com/questions/45677860

更新时间：2021-08-29 18:08

最满意答案

 优点：  
 CppUnit的主要优点是它遵循Setup / Test / Teardown的XUnit模式。 具有XUnit经验的任何人都能理解这种范例。 必须使用宏而不是属性或反射（就像使用.Net或Java XUnit框架一样）是一种解决方法，但不是真的很麻烦。  
 而CppUnit本身就是可移植的。 虽然TestRunner.DLL GUI完全是在MFC中构建的，因此只是Windows，但命令行版本不使用Microsoft特定代码，并且在许多平台上执行。  
 它也很稳定。 开发人员多年来几乎没有做任何事情，主要是因为它的核心不需要任何东西。 它做得很好。  
 缺点：  
 遗憾的是，缺点是缺乏最终用户支持。 我最大的抱怨是没有好的工具可以将CppUnit集成到IDE中。 我认为最严重的原因是测试需要纪律。 任何使单元测试比它必须更难的东西都将被用作不做的借口。  
 您可以手动添加格式以输出Visual Studio将正确解释的测试失败行（因此双击它将带您进入测试中失败的ASSERTion。）但是这不附带该工具，您必须学习它在外部像这样的网站上。  
 您可以编写一个IDE插件，为您生成单元测试框架代码，但我知道没有这样的插件可以公开使用。 同样，这对开发人员来说也很容易。  
 由于没有集成，因此也没有关于将CppUnit项目合并到代码库中的已发布指南。 这使得入门非常困难。  
 如果您确实设法使其正常工作，则有几个人会报告幻像CppUnit项目签入/签出问题。  
 CppUnit不支持任何特定的模拟框架。 由于大多数模拟框架使用反射来使开发模拟无痛，因此C ++总是会受到影响。  
 备择方案：  
 那里有许多很多C ++单元测试框架。 Googletest从某些人那里获得了很好的评价。 CppUnitLite受到一些人的赞扬，但我发现它非常令人困惑和无益。 CxxUnit需要一个笨拙的Python扫描和解析步骤 - 对于不太文明的年龄来说，这是一种不那么优雅的武器。 在这个领域有许多商业人士提供他们的商品。  
 我推荐http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#C.2B.2B获取非常丰富的备选方案列表。  
 虽然我还没有机会使用它，但我知道Visual Studio 2012已经整合了Microsoft自己的测试套件工具，并使其可用于本机C ++代码。 以前，它只能通过.Net集成工作，这对大多数C ++代码来说都是无用的。 我真的很期待拥有一整套工具，包括他们的代码覆盖集成，它突出了您测试的代码，显示您的测试覆盖范围的差距。  
 一句话：如果我今天重新开始，我会选择一个与XUnit兼容的不同测试框架，一个与IDE完全集成的测试框架。 当我们选择CppUnit时，它是Visual Studio 6.0中城里最好的游戏，但现在我们只是和它一起生活。 

Advantages: 
The primary advantage of CppUnit is that it follows the XUnit patterns of Setup / Test / Teardown. The paradigm is understood by anyone with XUnit experience. Having to use macros instead of attributes or reflection (as you do with .Net or Java XUnit frameworks) is a bit of a workaround, but not really burdensome. 
And CppUnit itself is portable. Although the TestRunner.DLL GUI is built entirely in MFC and is therefore Windows only, the command line version uses no Microsoft specific code, and executes on many platforms. 
It's also very stable. The developer has done almost nothing with it for many years, mostly because its core needs nothing. It does its one thing very well. 
Disadvantages: 
The disadvantages are unfortunately that end user support is lacking. My biggest complaint is that there are no good tools that integrate CppUnit into an IDE. The reason I consider this most severe is that testing requires discipline. Anything that makes unit testing harder than it has to be will be used as an excuse to not do it. 
You can manually add a format to output a test failure line that Visual Studio will properly interpret (so double clicking on it will take you to the failing ASSERTion in the test.) But this doesn't ship with the tool, you have to learn it externally on sites like this one. 
You can write an IDE plugin that will generate unit test skeleton code for you, but I am aware of no such plugins being made publicly available. Again, this is something that needs to be easy for developers. 
Because there is no integration, there is also no published guidance on incorporating a CppUnit project into your codebase. That makes it very hard to get started.  
If you do manage to get it working, several people report problems with phantom CppUnit project check-in / check-out problems. 
CppUnit doesn't support any particular mocking framework. As most mock frameworks use reflection to make developing mocks painless, C++ is always going to suffer a bit there. 
Alternatives: 
There are many, many C++ unit testing frameworks out there. Googletest gets good reviews from some people. CppUnitLite is praised by some, but I found it very confusing and unhelpful. CxxUnit requires a clumsy Python scanning and parsing step - a less elegant weapon for a less civilized age. And there are many commercial players in this space, offering their wares. 
I'd recommend http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#C.2B.2B for a very rich list of alternatives. 
While I have not yet had the chance to use it, I understand that Visual Studio 2012 has incorporated Microsoft's own test suite tooling and made it available for native C++ code. Previously, it only worked through .Net integration, which was useless for most C++ code. I'm really looking forward to having a full suite of tools, including their code coverage integration, where it highlights your tested code, showing you gaps in your test coverage. 
Bottom line: if I were starting over today, I would choose a different XUnit-compatible test framework, one that was fully integrated with the IDE. Back when we chose CppUnit, it was the best game in town for Visual Studio 6.0, but now we're just living with it.

向量对通过对元素的差异进行排序(vector pair sorting by the difference of the pair elements)

最满意答案

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