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This approach leverages the fact that we have access to the node to be deleted and that deletion does not mean removing from memory but rather bypassing this node.
By copying the value from the next node to the node to be deleted and rearranging the pointers, we can effectively 'delete' the node without needing access to the head of the list.
Time Complexity: O(1) since we're performing constant-time operations.
Space Complexity: O(1) because we aren't using any auxiliary data structures.
1public void DeleteNode(ListNode node) {
2 if (node == null || node.next == null) return;
3 node.val = node.next.val;
4 node.next = node.next.next;
5}In C#, the approach similarly updates the node directly, and the garbage collector handles memory cleanup.
This approach uses two pointers to manage nodes, allowing for a genuine swap and linkage manipulation. It reinforces the conceptual understanding of linked list pointer adjustments.
Note: The fundamentals are the same as we still replace and link to carry out the 'deletion'.
Time Complexity: O(1), never fluctuating beyond direct node handling.
Space Complexity: O(1), not utilizing external structures.
1In C, we manage two pointers internally to achieve the same result, illustrating the necessity to understand pointer accessibility and connectivity.