• Question
• Solution

Question

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.

Solution

Result: Accepted Time: 4 ms

Here should be some explanations.

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */
void deleteNode(struct ListNode* node) {
    struct ListNode * tmp = node->next;
    node->val = tmp->val;
    node->next = tmp->next;
    free(tmp);
}

Complexity Analytics

• Time Complexity: $O(n)$
• Space Complexity: $O(1)$