単一チェーンテーブルの作成、割り当てC++の例

#include 
using namespace std;
struct ListNode {
    int val;
    struct ListNode *next;
    ListNode(int x) :
    val(x), next(NULL) {
    }
    
};
ListNode* CloneList(ListNode* pHead){
    ListNode* pNode = pHead;
    ListNode* pCloneHead, *pCloneNode;
    if (pNode) {
        pCloneNode = new ListNode(pNode->val);
        pCloneNode->next = NULL;
        pHead = pCloneNode;
        pNode = pNode->next;
    }
    while (pNode) {
        ListNode* pTemp = new ListNode(pNode->val);
        pCloneNode->next = pTemp;
        pCloneNode = pTemp;
        pCloneNode->next = NULL;
        pNode = pNode->next;
        
    }
    return pCloneHead;
}

void printList(ListNode* pHead){
    ListNode* pTraverse = pHead;
    if (!pTraverse) {
        return;
    }
    while (pTraverse) {
        cout<< pTraverse->val << " ";
        pTraverse = pTraverse->next;
    }
    cout<< endl;
}

ListNode* CreatList(){
    ListNode* pNode = new ListNode(0);
    pNode->next = NULL;
    ListNode* pHead = pNode;
    
    for (int i = 1; i < 5; i++) {
        ListNode* pTemp = new ListNode(i);
        pNode->next = pTemp;
        pNode = pTemp;
    }
    return pHead;
}
int main(){
    ListNode* p = CreatList();
    printList(p);
    ListNode* pClone = CloneList(p);
    printList(pClone);
}