Title description Enter a linked list and return an ArrayList from the end of the list. Analysis To understand the data structure of linked lists: The val property stores the current value and the next property stores a reference to the next node. To traverse the linked list is to find the next node of ..

#### Category : Data structure

Introduction to Binary Tree Basic structure: function TreeNode(x) { this.val = x; this.left = null; this.right = null; } Definition of traversal of binary tree’s pre-order, mid-order and post-order; Preorder traversal: for any subtree, first access heel, then traverse its left subtree, and finally traverse its right subtree; Mid-order traversal: for any subtree, first traverse ..

Introduction to Binary Tree Basic structure: function TreeNode(x) { this.val = x; this.left = null; this.right = null; } Definition of traversal of binary tree’s pre-order, mid-order and post-order; Preorder traversal: for any subtree, first access heel, then traverse its left subtree, and finally traverse its right subtree; Mid-order traversal: for any subtree, first traverse ..

subject Two stacks are used to implement a queue to complete Push and Pop operations of the queue. The elements in the queue are of type int. Basic idea Stack 1: For in-queue storage Stack 2: When leaving the queue, the data of stack 1 are sequentially pushed out of the stack and merged into ..

subject To define the data structure of the stack, please implement a min function (time complexity should be O(1)) in this type that can obtain the minimum elements contained in the stack. Train of thought 1. Define two stacks, one stack is used to store data and the other stack is used to store the ..

1. Stack containing min function To define the data structure of the stack, please implement a min function (time complexity should be O(1)) in this type that can obtain the minimum elements contained in the stack. Train of thought 1. Define two stacks, one stack is used to store data and the other stack is ..