Leetcode ☞237. Delete Node in a Linked List ☆
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Total Accepted: 65936 Total Submissions: 150816 Difficulty: Easy
Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.
Supposed the linked list is 1 -> 2 -> 3 -> 4
and you are given the third node with value 3
, the linked list should become 1 -> 2 -> 4
after calling your function.
我的AC(4ms,前98%):
/** * Definition for singly-linked list. * struct ListNode { * int val; * struct ListNode *next; * }; */void deleteNode(struct ListNode* node) { struct ListNode *p; p = node->next; node->val = p->val; node->next = p->next; free(p);}
分析:
认真读题。提供的是所要删除的那个节点!!!没给各个节点的值也没给长度。
所以把该node的所有“属性”都改成“node->next”的属性,这时原node其实就已经没了(有两个node->next)!然后free掉node->next。
链表的题,画图后就很容易理解。
举个例子:
a->b->c->d->e->····->z,要删c。
那我们其实不是真删了c,(实际是删了c->next)。我们把d的val跟d->next都给c,原链表就变成了
a->b->d(本来是C,值改成了d)->e->····->z 和 d->e->····->z。 然后free掉这个枝杈d。
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