237. Delete Node in a Linked List

易错点：

顺序

class Solution {
public:
    void deleteNode(ListNode* node) {
        if (!node) return;
        ListNode* prev = nullptr;
        while (node -> next){
            node -> val = node->next ->val;
            prev = node;
            node = node -> next;
        }
        prev->next = nullptr;        
        return;
    }
};