// 合并两个已序单链表

PSListNode MergeList(PSListNode pL1, PSListNode pL2)

{

                 PSListNode pNewHead = NULL ;

                 PSListNode pL1Node = pL1 ;

                 PSListNode pL2N0de = pL2 ;

                 PSListNode pNode = NULL ;

                 PSListNode pTailNode = NULL ;

                 if (pL1 == NULL)

                {

                                 return pL2 ;

                }

                 if (pL2 == NULL)

                {

                                 return pL1 ;

                }

                 if (pL1Node->data > pL2N0de->data)

                {

                                pNode = pL2N0de;

                                pL2N0de = pL2N0de->pNext;

                }

                 else

                {

                                pNode = pL1Node;

                                pL1Node = pL1Node->pNext;

                }

                pNewHead = pNode;

                pTailNode = pNode;

                 while (pL1Node&&pL2N0de)

                {

                                 if (pL1Node->data > pL2N0de->data)

                                {

                                                pNode = pL2N0de;

                                                pL2N0de = pL2N0de->pNext;

                                }

                                 else

                                {

                                                pNode = pL1Node;

                                                pL1Node = pL1Node->pNext;

                                }

                                pTailNode->pNext = pNode;

                                pTailNode = pTailNode->pNext;

                }

                 if (pL1Node == NULL )

                {

                                pTailNode->pNext = pL2N0de;

                }

                 else

                {

                                pTailNode->pNext = pL1Node;

                }

                 return pNewHead;

}

void Print(PSListNode pHead)

{

                 PSListNode pCurNode = pHead ;

                 while (pCurNode)

                {

                                printf( "%d->", pCurNode->data);

                                pCurNode = pCurNode->pNext;

                }

                printf( "NULL\n");

}