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preface The difference between ArrayList and LinkedList is often mentioned. A clear understanding of the difference between them is helpful to consolidate their basic development skills. Choosing the right data structure in the right place can help them write more high-quality code. Combined with their source code, this paper analyzes th ...

On the first day of 2022, tiger, tiger, I wish you a happy year of the tiger!!! Here comes the first blog of the year catalogue 1. Questions raised 2. Comparison of elements 2.1} element comparison 2.2 comparison of objects 3. Comparison of objects 3.1 override equal of base class 3.2 comparison based on Comparble interface ...

Stack and queue: A stack is a linear table that is restricted to insert and delete operations only at the end of the table. We call the end that allows insertion and deletion as the top of the stack, the other end as the bottom, and the stack without any elements as an empty stack. The stack becomes a linear table of Last In First Out (LIFO st ...

1, Title Given the post order traversal and middle order traversal of a binary tree, please output the sequence of its sequence traversal. It is assumed that the key values are positive integers that are not equal to each other. Input format: The first line of input gives a positive integer N (≤ 30), which is the number of nod ...

1, Key analysis 1. Insert node Inserting a node is relatively simple. You only need to judge the key value, replace the corresponding key value, or create a new key value. // Insert the node (key, value) into the binary search tree with node as the root, and use the recursive algorithm // Returns the root of the binary search tree ...

What is a space configurator? Space configurator is used to efficiently manage space (space application and recycling) for each container Why do I need a space configurator Implement vector, list, map and unordered in simulation_ Map and other containers, all places that need space are applied through new , although the code can run norm ...

Double pointers are mainly divided into two categories: fast and slow pointers and left and right pointers Speed pointer For the linked list problem, we can generally use the speed pointer to solve it The so-called speed pointer refers to using two pointers to advance at different speeds. There are two pointers that we can determine: Is there ...

P3700 [CQOI2017] table of small Q Description There is a table with infinite rows and columns. The rows and columns start with \ (1 \), and the \ (a \) row \ (B \) column has an integer \ (f(a, b) \); \(f(a, b) \) shall meet: \(\forall a, b \in \mathbb{N}^*, f(a, b) = f(b, a)\)； \(\forall a, b\in \mathbb{N}^*, b\cdot f(a, a + b) = (a + b) \c ...

1 common search concepts Lookup refers to determining a data element whose keyword is equal to the given value in the lookup table according to a given value.A lookup table is a collection of data elements or records of the same type.Keyword is the value of a data item in a data element, also known as key value. The primary keyword can uniquel ...

Day 19 884 unusual words in two sentences A sentence is a string of words separated by spaces. Each word consists of only lowercase letters. If a word happens to appear once in one sentence but does not appear in the other sentence, the word is not common. Give you two sentences s1 and s2 and return a list of all the infrequently used words ...