link list?

[tanhhn58]

pls explane me

#include <iostream>

using namespace std;

struct Node{
    int data;
    Node *pNext;
};

struct List{
    Node *pHead;
    Node *pTail;
};

void Init(List &l){
    l.pHead = l.pTail = NULL;
}

Node* GetNode(int x){
    Node *p = new Node;
    if(p == NULL)
        return NULL;
    p ->data = x;
    p ->pNext = NULL;
    return p;
}

void AddTail( List &l, Node *p){
    if( l.pHead == NULL){
        l.pHead = l.pTail = p;
    }else{
        l.pTail ->pNext = p;
        l.pTail = p;
    }
}

void input(List &l){
    int n;
    cout << "Nhap so Node : ";
    cin >> n;
    Init(l);
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        Node *p = GetNode(x);
        AddTail(l, p);
    }
}

void timMax(List l){
    int x = l.pHead ->data ;
    for(Node *p = l.pHead; p != NULL; p = p ->pNext){
        if( p ->data > x)
            x = p ->data;
    }
    cout << "\nMax : " << x;
}



int main(){
    List l;
    input(l);
    timMax(l);
    return 0;
}