带头结点的单链表head为空的条件是 。
head -> next =Null
head->next==NULL;
head->next==Null
head->next==null
head→next==null
head->next == NULL;
head->next==null;
head → next = null
head.next =head;
head -> next == NULL;
head-＞next==NULL
head->next == NULL
head->next=null;
head->next == null
head->next = NULL;
head->next==NULL
head ->next == NULL;
head -> next == NULL
Head → next == null
Head->next = head
head->next=null
head-next=null
head->next==nnull
head-＞next == NULL;
head->next ==NULL
L->next==NULL
head的next等于null
head-next==NULL;
head－＞next=Null
dd
head->next = = null
head->next==nullptr
head=null
head->next=NULL
head->next = nullptr;
st
head->next== null
head->next == null;
head->next=Null;
head->next=NULL;
head -> next = null
head->next = null
head-＞next=null
head ->next = NULL;
head ->next = NULL
L->next==null
Head->next == NULL;
head->next==NU...
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