Question

需要你的帮助。我有以下问题，例如我有一个公式，我可以检查一个站是否在每一行。我找到了它，但后来我需要每次检查，它可以是一行有10个站。然后我走一条线（multimap）创建一个线的名称以及该线上的站点。到目前为止我已经实现了以下代码。

multimap<int, int>numberofStation;
for (int newSt = 0; newSt <dimentionOfNewStation; newSt++)
{
    int station = 0;

    for (int Edges = 0; Edges < dimenstionOfEdges; Edges++)
        {
        float firstsol = 0;
        float secondsol = 0;
        float thirdsol = 0;
        firstsol = (busEdges[Edges].y2 - busEdges[Edges].y1) / (busEdges[Edges].x2 - busEdges[Edges].x1);//check if a station on that line
        secondsol = (apointCollection4[newSt].y- busEdges[Edges].y1) / (apointCollection4[newSt].x - busEdges[Edges].x1);//check if a station on that line
        thirdsol = (busEdges[Edges].y2 - apointCollection4[newSt].y) / (busEdges[Edges].x2 - apointCollection4[newSt].x);//check if a station on that line

            if (firstsol == secondsol && firstsol == thirdsol)//values should be the same
                {
                    station = Edges;//i take that edge/line(id)
                }


        }
    if (numberofStation.find(station) == numberofStation.end())
    {
        numberofStation.insert(pair<int, int>(station, newSt));//i add that station to that line
    }
    else
    {
        here i need to have a line of station for each line( 0 line has 2,5,3 station)
    }

}
for (auto it = numberofStation.begin(); it != numberofStation.end(); it++)
{
    and how i can print it out in the order i want above.

}

请告诉我，如果有可能这样的想法，或者它可能是非常疯狂，请告诉我如何做到这一点的方式。所以这个想法，我需要找到每一行的站数。

提前致谢

Answer 1

与selyunin一样，我不太确定你要求的是什么也许它的std::equal_range()或（因为它无论如何都是多图）{/ 3}}就像在

中一样

std::multimap<int,int> m;
m.insert(pair<int, int>(0, 1));
m.insert(pair<int, int>(2, 2));
m.insert(pair<int, int>(1, 3));
m.insert(pair<int, int>(1, 4));
m.insert(pair<int, int>(0, 5));
m.insert(pair<int, int>(1, 6));

int station = 1;

// get the range of entries having (station) as "key"/first   
auto r = m.equal_range(station);
while(r.first!=r.second) {
    cout << (*(r.first)).second << ' ';
    r.first++;
}

打印3 4 6

我需要在一行中使用相同的键具有所有值

1 个答案: