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The HashMap data structure is very useful in most development scenarios, so we must understand its underlying principle when using it, so that we can skillfully optimize our program according to its design when using it. Later, I will explain several problems and try to be easy to understand. 1. How is the process of hash index calculation imp ...

Find the shortest path of the maze How to find the shortest path in the maze??? Use the breadth traversal maze path to search for the shortest path: 0 0 1 1 1 1 1 0 0 0 0 1 1 0 1 1 0 1 1 0 0 0 0 1 1 0 1 1 1 1 1 0 0 0 0 0 Breadth first traversal to find the shortest path If the value of (0,0) is 1, it means that the intersection of the m ...

sort The concept and application of sorting Sorting concept ==Sorting: = = the so-called sorting is the operation of arranging a string of records incrementally or decrementally according to the size of one or some keywords. ==Stability: = = if there are multiple records with the same keyword in the record sequence to be sorted, th ...

catalogue 10, property_tree (1) Processing xml 1. Write xml and modify xml 2. Parsing xml 3.get() accesses the node through the path 4.get_child() gets a node object with multiple child nodes 5.find() shallow search 6.get_optional() 7. Get comments and attribute values (2) Deal with Jason (3) Processing ini (4) Processing info 10, ...

1. Problem description Independent variables: the influencing factors of the optimal distillation structure are the feed composition A, B, C, the ratio of relative volatility ESI, and the separation requirements GESI, where A+B+C=1, so the degrees of freedom of the five independent variables are 4. Dependent variable: there are 7 kinds of thr ...

data structure Basic concept and operation of linear table (I) Mind map 2.1 definition and basic operation of linear table 2.1.1 definitions A linear table is a finite sequence of n (n ≥ 0) data elements with the same data type, where n is the table length. When n = 0, the linear table is an empty table. If L is used to name t ...

1, Sequential storage structure Sequential table, full name sequential storage structure, is a kind of linear table. Linear tables are used to store data with "one-to-one" logical relationship, and sequential tables are no exception. When storing data in the sequence table, a whole physical space of sufficient size will be appli ...

Introduction to search algorithm In java, there are four common Searches: 1. Sequential (linear) search 2. Binary search / half search 3. Interpolation search 4. Fibonacci search Linear search There is a sequence: {1,8,10,8910001234}. Judge whether the sequence contains this name [sequential search] Requirement: if it is found, it wil ...

Summary of data structure binary tree traversal ⭐⭐⭐ The concept of binary trees 1. The feature is that each node has at most two subtrees, left subtree and right subtree. 2. Full Binary Tree: i<=n/2 Round down, I is preceded by non-leaf nodes, I is followed by leaf nodes (1) If n is odd, every non-leaf node has left and right childr ...

1. Topic description and online test location 1.1 the input is the user name and its score. Since the score includes three parts: online, midterm and end of the period, the input data of the same user name may contain multiple entries; The calculation rule of the final score is: on the premise that the online score is no less than 200, if ...