237. Delete Node in a Linked Lis

看完题Write a function to delete a node in a singly-linked list. You will not be given access to the head of the list, instead you will be given access to the node to be deleted directly.

It is guaranteed that the node to be deleted is not a tail node in the list.

Example 1:

<pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 13px; margin-top: 0px; margin-bottom: 1em; overflow: auto; background: var(--dark-bg); border-color: rgb(51, 51, 51); color: var(--font) !important; padding: 10px 15px; line-height: 1.6; border-radius: 3px; white-space: pre-wrap;">Input: head = [4,5,1,9], node = 5
Output: [4,1,9]
Explanation: You are given the second node with value 5, the linked list should become 4 -> 1 -> 9 after calling your function.
</pre>

Example 2:

<pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 13px; margin-top: 0px; margin-bottom: 1em; overflow: auto; background: var(--dark-bg); border-color: rgb(51, 51, 51); color: var(--font) !important; padding: 10px 15px; line-height: 1.6; border-radius: 3px; white-space: pre-wrap;">Input: head = [4,5,1,9], node = 1
Output: [4,5,9]
Explanation: You are given the third node with value 1, the linked list should become 4 -> 5 -> 9 after calling your function.
</pre>

Example 3:

<pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 13px; margin-top: 0px; margin-bottom: 1em; overflow: auto; background: var(--dark-bg); border-color: rgb(51, 51, 51); color: var(--font) !important; padding: 10px 15px; line-height: 1.6; border-radius: 3px; white-space: pre-wrap;">Input: head = [1,2,3,4], node = 3
Output: [1,2,4]
</pre>

Example 4:

<pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 13px; margin-top: 0px; margin-bottom: 1em; overflow: auto; background: var(--dark-bg); border-color: rgb(51, 51, 51); color: var(--font) !important; padding: 10px 15px; line-height: 1.6; border-radius: 3px; white-space: pre-wrap;">Input: head = [0,1], node = 0
Output: [1]
</pre>

Example 5:

<pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 13px; margin-top: 0px; margin-bottom: 1em; overflow: auto; background: var(--dark-bg); border-color: rgb(51, 51, 51); color: var(--font) !important; padding: 10px 15px; line-height: 1.6; border-radius: 3px; white-space: pre-wrap;">Input: head = [-3,5,-99], node = -3
Output: [5,-99]
</pre>

Constraints:

• The number of the nodes in the given list is in the range [2, 1000].
• -1000 <= Node.val <= 1000
• The value of each node in the list is unique.
• The node to be deleted is in the list and is not a tail node

看完题懵逼了，看答案其实很简单：把当前的val替换成下一个val，再把当前的next指向下下一个

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    void deleteNode(ListNode* node) {
        node->val = node->next->val;
        node->next = node->next->next;
    }
};