合并两个有序单链表的操作

/*
struct ListNode {
    int val;
    struct ListNode *next;
    ListNode(int x) :
            val(x), next(NULL) {
    }
};*/

ListNode* Merge(ListNode* pHead1, ListNode* pHead2) //将两个非递减链表，合并为一个非递减链表并返回
{
    if(pHead1 == NULL)
        return pHead2;
    if(pHead2 == NULL)
        return pHead1;
    ListNode* new_List;
    ListNode* new_Head;
    if(pHead1->val < pHead2->val)
    {
        new_Head = pHead1;
        pHead1 = pHead1->next;
    }

    else
    {
        new_Head = pHead2;
        pHead2 = pHead2->next;
    }

    new_List = new_Head;

    while(pHead1!=NULL && pHead2!=NULL)
    {
        if(pHead1->val < pHead2->val)
        {
            new_List->next = pHead1;
            new_List = pHead1;
            pHead1 = pHead1->next;
        }

        else
        {
            new_List->next = pHead2;
            new_List = pHead2;
            pHead2 = pHead2->next;
        }
    }
    new_List->next = pHead1?pHead1:pHead2;
    return new_Head;
}