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// Definition for singly-linked list. // pub struct ListNode { pub val: i32, pub next: Option<Box<ListNode>> } impl Solution { pub fn remove_elements(root: Option<Box<ListNode>>, target: i32) -> Option<Box<ListNode>> { let mut root = root; while let Some(n) = root.as_ref() { ...

Swapping Adjacent Nodes in Linked List This algorithm swaps every two adjacent nodes in a linked list using a dummy head approach for consistent handling. Key implementation details: Use a dummy head node to simplify edge cases Maintain current pointer before the pair being swapped Careful manage temporary references during swapping Ensure loo ...

一 Arraylist 1、Three Implemented Interfaces public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable RandomAccess Interface: The ArrayList class implements the RandomAccess interface, which indicates that it supports efficient random access—accessing elemen ...