TempQuickDoubArray2, C++ (gcc)

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//g++  7.4.0
//Sorting template array using quick sort & double linked list
//code is created by Rezaul Hoque on March 20,2021
//please contact at jewelmrh@yahoo.com
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
template <class T>
class node{
public:
T val;
int p;
int q;
node<T>* next;
node<T>* prev;
void swap(node<T>& p, node<T>& q);
void quick(node<T> a[],T low, T high);
T part(node<T> a[],T low, T high);
};
template <class T>
void node<T>::swap(node<T>& p, node<T>&q ) {
node<T>  temp;
temp = p;
p = q;
q = temp;
}

template <class T>
T node<T>::part(node<T> a[],T low, T high){
T pivot = a[high].val;
    T i = (low - 1);  
 
    for (T j = low; j <= high- 1; j++)
    {
     
        if (a[j].val <= pivot)
        {
            i++;    
            swap(a[i], a[j]);
        }
    }
    swap(a[i + 1], a[high]);
    return (i + 1);
}

template <class T>
void node<T>::quick(node<T> a[], T low, T high)
{
    if (low < high)
    {
        
        T pi = part(a, low, high);
        quick(a, low, pi - 1);
        quick(a, pi + 1, high);
    }
}
 int main()
{
const int max=3;
node<char>* a;
a = new node<char>[max];

a[0].prev=NULL;
a[2].next = NULL;
for(int i=0; i<max; i++)
{
  a[i].next = a[i+2].prev;
}
a[0].val={'E'};
a[1].val={'D'};
a[2].val={'C'};
a[0].p={4};
a[1].p={2};
a[2].p = {6};
a[0].q={5};
a[1].q={4};
a[2].q = {8};
cout<<"Before quick sort:\n";

for(int i=0; i<max; i++)
{
cout<<a[i].val<<"\t"<<a[i].p<<"\t"<<a[i].q<<endl;
cout<<"\n";
}

cout<<"After quick sort:\n";
a->quick(a, 0, max-1);
for(int i=0; i<max; i++)
{
cout<<a[i].val<<"\t"<<a[i].p<<"\t"<<a[i].q<<endl;
cout<<"\n";
}
return 0;
}

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Compilation time: 1.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 1,68 sec