收到我无法理解的错误[重复]

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以下代码用于使用映射表示多项式。运行代码时出现一些错误。

超时：受监视的命令转储核心
sh：行1：29642分段错误

我尝试搜索Internet，但无法理解问题。

The coefficient should not be stored if the value is zero, and that's why I have made a check in getcoef().

#include <iostream>
#include <map>
using namespace std;

class Polynomial
{
    friend Polynomial& operator+(Polynomial &p1, Polynomial &p2);
    friend void display(Polynomial &p);
public:
    map<int, double> poly;
public:
    void getcoef()
    {
        cout<<"Enter degree of the polynomial";
        int d;
        cin>>d;
        for(int i=0; i<=d; ++i)
        {
            double ai;
            cin>>ai;
            if(ai != 0)
                poly[i] = ai;
        }
    }
};

void display(Polynomial &p)
{
    for(map<int, double>::iterator x= p.poly.begin(); x!=p.poly.end(); ++x)
    {
        cout<<x->first<<" : "<<x->second<<endl;
    }
}

Polynomial& operator+(Polynomial &p1,Polynomial &p2)
{
    Polynomial p;
    map<int, double>::iterator i= p1.poly.begin();
    for(i; i!=p1.poly.end(); ++i )
    {
        p.poly[i->first] = i->second;
    }

    map<int, double>::iterator k = p2.poly.begin();
    for(k; k!=p2.poly.end(); ++k)
    {
        map<int, double>::iterator j=p.poly.find(k->first);
        if(j!=p.poly.end())
            p.poly[j->first] += k->second;
        else
            p.poly[k->first] = k->second;
    }
    display(p);
    return p;
}

int main()
{
    Polynomial p1,p2;
    p1.getcoef();
    p2.getcoef();
    Polynomial p3;
    p3 = p1+p2;
    display(p3);
}
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