HashTabFold, C++ (gcc)

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//g++  7.4.0

//////////////////////////////////////////////////////////////////////////////
//HashTabFold:Understanding Hash Table where folding method is used for hashing
//class HashT code credit goes to www.programiz.com & www.educba.com,HashFold() code credit goes to www.indiastudychannel.com. For more see https://www.indiastudychannel.com/experts/3245-hashing-by-folding-using-c
//Template modifications and main driver code are created by Rezaul Hoque on September 17,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
///////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>
#include <list>
#include <cmath>

template <class T>
class HashT{

int sz;
std::list<T> *tab;
public:
HashT(int n){ this->sz=n;
tab=new std::list<T>[sz];}
int HashFold(int x)
{
  
 int z,y=2,s=0,s1=0,e;
int flag=0,h,index;
z=pow(10,y);
while(x>0)
{
e=x%z;
x=x/z;
if(flag==0)
{
while(e>0)
{
h=e%10;
e=e/10;
s1=s1*10+h;
}
flag=1;
e=s1;
}
s=s+e;
}
index=s%sz;
return index;

}

void insert (int key, T data){
tab[HashFold(key)].push_back(data);
}
void print(){
int i;
for(i=0;i<sz;i++){
std::cout<<i<<" "<<"\n";
for(auto p : tab[i])

std::cout<<"->"<<p<<"\n";
  }
 }
};

int main()
{
    std::string s[]={"Hi","Hola","Ni Hao","Salut","Konnichiwa","Salam","Namastey"};
int k[]={112,321,322,234,333,111,200};
int size =sizeof(k)/sizeof(k[0]);
HashT<std::string> h(size);
for(int r=0;r<size;r++)
h.insert(k[r],s[r]);
h.print();
return 0;
}

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Compilation time: 0.62 sec, absolute running time: 0.16 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,85 sec