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HashMap Source Analysis HashMap is a common key-value collection implementation class in Java that implements the Map interface. data structure Core: The whole is an array;Each position of the array is a chain list (or a red-black tree);The Value in each node of the list is the Object we store; JDK 1.7 data structure Array+Chain List ...

1. Sword finger Offer 32 - I. print binary tree from top to bottom Sword finger Offer 32 - I. print binary tree from top to bottom Idea: use the queue to traverse the hierarchy class Solution { public int[] levelOrder(TreeNode root) { if(root==null) return new int[0];//When root is null, return [] A ...

Sequential storage structure and chain storage structure of linear table and their simple operation (mixed use of C and C + +)1, Preface:In the first computer experiment when learning data structure, the teacher asked us to realize the sequential storage structure and chain storage structure of linear table and their simple operation. It was pa ...

What is a jump watch The full name of jump list is jump list. It allows you to quickly query, insert and delete a data linked list of ordered and continuous elements. The average search and insertion time complexity of the jump list is O(logn). Fast query is performed by maintaining a multi-level linked list, and the elements in each layer of ...

1, What is the of a tree array We first need to understand what a tree array is. A tree array is a data structure. Its main function is to efficiently realize interval summation and single point modification. We can know that the most efficient interval summation is computation Prefix and Array thus O ...

Chapter IV string 4.1 string A String is a finite sequence of zero or more characters For example: S = "Hello World!"; Double quotation marks (Java, C) are used in some places; Use single quotation marks where necessary (Python) Substring - composed of any consecutive characters; Main string - a string containing substrings Em ...

1, Time complexity Constant time operation If an operation has nothing to do with the data volume of the sample and is completed within a fixed time each time, it is called Changshu operation. For example, int a = arr[i] at this time, it is only to find the offset in the array and the number of I position. This is a constant operation, in ...

1. Experimental topic      There is only one narrow passage for n cars in the parking lot, and only one gate for cars to enter and exit. The cars in the parking lot are arranged from north to south according to the sequence of vehicle arrival time (the gate is at the southernmost end, and the first car arriving first is par ...

preface This chapter introduces the storage elements in the data structure - the sequential table in the linear table Linear table A linear list is a finite sequence of n data elements with the same characteristics. Linear table is a data structure widely used in practice. Common linear tables: sequential table, linked list, stac ...

1. Definition of heap A heap is a special kind of complete binary tree in which the father node must be greater than or equal to its child node (this is called a heap) or the father node must be less than or equal to its child node (this is called a heap). _The so-called complete binary tree is a kind of binary tree whose nodes are arrang ...