题目:
示例:
思路:
这个题类似于寻找链表中间的数字,slow和fast都指向head,slow走一步,fast走两步,也许你会有疑问,节点数的奇偶不考虑吗?while执行条件写成fast&&fast->next就OK,不理解可以画个图,自己举个例子就能看懂了。
代码:
struct ListNode* deleteMiddle(struct ListNode* head)
{
if(head == NULL || head->next == NULL)
return NULL;
struct ListNode* prev = NULL;
struct ListNode* slow = head;
struct ListNode* fast = head;
while(fast && fast->next)
{
prev = slow;
slow = slow->next;
fast = fast->next->next;
}
struct ListNode* next = slow->next;
prev->next = next;
free(slow);
return head;
}
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