Using standard template library (STL) list container implement following member functions of list class: empty, insert, merge, reverse, sort, Unique, using iterator

#include<iostream>
#include<list>
#include<cstdlib>
using namespace std;
void display(list <int> &lst)
{
list<int> :: iterator p;
for(p=lst.begin();p!=lst.end();++p)
cout<<*p<<",";
cout<<"\n\n";
}
int main()
{
    list<int> list1;
list<int> list2(5);
for(int i=0;i<3;i++)
list1.push_back(rand()/100);
list<int>::iterator p;
    for(p=list2.begin();p!=list2.end();++p)
*p=rand()/100;
cout<<"list1\n";
display(list1);

cout<<"list2\n";
display(list2);

list1.push_front(100);
list1.push_back(200);

list2.pop_front();

cout<<" Modified list1\n";
display(list1);

cout<<"Modified list2\n";
display(list2);

list<int>listA,listB;
listA=list1;
listB=list2;

list1.merge(list2);

cout<<"merged unsorted list";
display(list1);


listA.sort();
listB.sort();
listA.merge(listB);
cout<<"Merged sorted list\n";
display(listA);


listA.reverse();
cout<<"Reversed sorted list\n";
display(listA);
return 0;
}