LeetCode-E-Delete Node in a Linked List

題目

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.

解法

交換delete node和其 next node的value，然後刪除next node

實現

/**
 * 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 != NULL){
            ListNode* next = node->next;
            node->val = next->val;
            node->next = next->next;
        }
    }
};