Delete Node in a Linked List — C++

// Time:  O(1)
// Space: O(1)

/**
 * 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) {
        if (!node || !node->next) {
            return;
        }
        auto node_to_delete = node->next;
        node->val = node->next->val;
        node->next = node->next->next;
        delete node_to_delete;
    }
};