LeetCode19. 删除链表的倒数第 N 个结点
19. 删除链表的倒数第 N 个结点
给你一个链表,删除链表的倒数第 n
个结点,并且返回链表的头结点。
示例 1:
输入:head = [1,2,3,4,5], n = 2
输出:[1,2,3,5]
示例 2:
输入:head = [1], n = 1
输出:[]
示例 3:
输入:head = [1,2], n = 1
输出:[1]
提示:
- 链表中结点的数目为
sz
1 <= sz <= 30
0 <= Node.val <= 100
1 <= n <= sz
代码
class Solution {
public:
ListNode* removeNthFromEnd(ListNode* head, int n) {
int size = 0;
ListNode* dummyNode = new ListNode(-1);
dummyNode->next = head;
ListNode* cur = head;
while (cur != NULL) {
cur = cur->next;
size++;
}
cur = dummyNode;
for (int i = 0; i < size - n; i++) {
cur = cur->next;
}
cur->next = cur->next->next;
return dummyNode->next;
}
};
原文地址:https://blog.csdn.net/henghuizan2771/article/details/135922973
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