Code using Prototype Design Pattern compiling but not running

I'm trying to use the Prototype Design Pattern with a queue to store values from it. My code compiles but does not run. I thought maybe my code was too inefficiently running, but it just stops instead of running slowly.

#include <iostream>
#include <vector>
#include<string>
#include<queue>

using namespace std;

class process 
{
public:
process(const string state): state(state){}

virtual process* clone() =0;
virtual void report() =0;
virtual void changeState(const string&) =0;
virtual ~process(){}
protected:
string state="new";
};

class process1: public process{
public:
process1(const string state): process(state){}

// clone
process1* clone() override {return new process1(state);}
void report(){cout<<state;}
void changeState(const string& c){
  
if (c=="new")
    state="Ready";
else if (c=="Ready")
    state="Running";
else if (state=="Running")
{
    int x=rand()%3;
    if(x==0)state="Terminate";
    if (x==1)state="Ready";
    if (x==2)state="Waiting";
}
else if (c=="Waiting")
state="Ready";
}
};


int main()
{
    queue<process*> q;
    process1 a("new");
    for(int i=0;i<4;++i)
        q.push(a.clone());
}

Any suggestions on what to do would be appreciated.