Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.
Given linked list -- head = [4,5,1,9], which looks like following:
4 -> 5 -> 1 -> 9
Example 1:
Input: head = [4,5,1,9], node = 5 Output: [4,1,9] Explanation: You are given the second node with value 5, the linked list should become 4 -> 1 -> 9 after calling your function.
Example 2:
Input: head = [4,5,1,9], node = 1 Output: [4,5,9] Explanation: You are given the third node with value 1, the linked list should become 4 -> 5 -> 9 after calling your function.
Note:
- The linked list will have at least two elements.
- All of the nodes' values will be unique.
- The given node will not be the tail and it will always be a valid node of the linked list.
- Do not return anything from your function.
My solution:
# Definition for singly-linked list.
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
def deleteNode(self, node):
"""
:type node: ListNode
:rtype: void Do not return anything, modify node in-place instead.
"""
node.val = node.next.val
node.next = node.next.next
This is good description.
I was hope to understand it by walking through it step by step and getting feedback. Can any confirm my description below is correct.
class Solution(object):
def deleteNode(self, node):
# Summary: To achieve appearance of deleting the node, we actually need to copy the data for the next node
# into the node that we were asked to delete then update the node's pointer to the next nodes pointer value
# Input third node with value 3
# {value: 3, pointer: fourth node}
# Debugging
node.val = node.next.val
# node.val equals 3
# node.next.val equals 4
# node.val assigned the value of 4
# Output
# 1 -> 2 -> 4 -> 4
node.next = node.next.next
# node.next = third node
# node.next.next = NULL/None
# node.next assigned NULL/None
# Output
# 1 -> 2 -> 4
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