Untitled

#include <bits/stdc++.h>
using namespace std;
 
class Planet
{
    friend class Galaxy;
    public:
    	Planet(string planet,int a,int b,int c,float m)
		:name(planet),x(a),y(b),z(c),mass(m),next(NULL){}
		Planet(const Planet &a)
		:next(a.next),name(a.name),x(a.x),y(a.y),z(a.z),mass(a.mass){}
		Planet *next;
        float mass;
        string name;
        int x,y,z;
        //Todo Constructor to initialize Planet
        //Todo operator overloading
 		Planet operator +(const Planet &b){
 			Planet* pl= new Planet(*this);
 			pl->next=NULL;
 			pl->name+=b.name;
 			pl->x=floor((pl->x*pl->mass+b.x*b.mass)/(pl->mass+b.mass));
			pl->y=floor((pl->y*pl->mass+b.y*b.mass)/(pl->mass+b.mass));
			pl->z=floor((pl->z*pl->mass+b.z*b.mass)/(pl->mass+b.mass));
			pl->mass+=b.mass;
			return *pl;
		}
		bool operator ==(const Planet &b)
		{
			if(name!=b.name||next!=b.next||mass!=b.mass||x!=b.x||y!=b.y||z!=b.z)
				return false;
			return true;
		}
		bool operator >(const Planet &b){
			return (mass>b.mass);
		}
		bool operator <(const Planet &b){
			return (mass<b.mass);
		}
        void Info()
        {
            cout<<name<<'('<<x<<','<<y<<','<<z<<','<<mass<<")\n";
        }
};
bool cmp(pair<float,Planet*> a,pair<float,Planet*> b){
	return a.first<b.first;
}
class Galaxy
{
    private:
        string name;
        Planet *head;
    public:
        Galaxy(string na, Planet A) : name(na)
        {
            head = &A;
        }
        void Add(Planet A)
        {
            if(head==NULL){
                head = &A;
                return;
            }
            Planet *current = head;
            while (current->next != NULL) {
                current = current->next;
            }
            current->next = &A;
        }
        void Delete(Planet &A)
        {	
        	if(head==NULL)
        		return;
        	if(*head==A)
        	{
        		Planet* q=head;
        		head=head->next;
        		delete q;
			}
			else
			{
				Planet* pre=head;
				Planet* cur=head->next;
				while(cur!=NULL)
				{
					if(*cur==A)
					{
						pre->next=cur->next;
						delete cur;
						return;
					}
					else
					{
						cur=cur->next;
						pre=pre->next;
					}
				}
			}
        }
        void Status()
        {
            cout<<name<<'\n';
            Planet *q=head;
            vector<pair<float,Planet*>> A;
            while(q!=NULL)
            {
            	A.push_back(make_pair(q->mass,q));
            	q=q->next;
			}
			sort(A.begin(),A.end(),cmp);
			for(int i=A.size()-1;i>=0;i--)
				A[i].second->Info();
        }
        ~Galaxy()
        {
        	Planet *q=head;
        	while(head!=NULL)
            {
            	head=head->next;
            	delete q;
			}
		}
};
int main(){
    Planet A = Planet("Alen",788,224,-301,4723.3);
    Planet B = Planet("Grace",110,-8,23,80.9);
    Galaxy a("Pretty",A);
    if (A>B) cout<<"A>B"<<endl;
    else cout<<"A<B"<<endl;
    a.Status();
    Planet C = Planet("Mary",472,-5,999,0.001);
    Planet CC = Planet("Mary",472,-5,999,0.001);
    if (C==CC) cout<<"!twins!"<<endl;
    Galaxy b("Awesome",C);
    Planet D =  Planet("Jupyter",49,0,-1002,1231);
    D.Info();
    Planet F = C+B;
    F.Info();
    Galaxy c("Chill",F);
    c.Delete(F);
    c.Status();
    Planet G = F+D;
    b.Add(G);
    b.Add(D);  
    a.Delete(A);
    a.Add(F);
    a.Add(B);
    a.Add(G);
    a.Status();
}