binary tree preorder traversal ** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; * ** * Return an array of size *returnSize. * Note: The returned arr...

I have two elements, a parent element and a child element. the parent element rotates N degrees. then I want to move the positioning of the child element, which moves relative to the parent element. how do I calculate the offset value. Let it move re...

paper in: Finding odd cycle transversals but when I read this paper , I only know that the idea of the algorithm is recursion, and then wiki : odd cycle transversal the description of odd cycle transversal is to remove k points into a bipartit...

I don t know how to describe the seed nodes, which are those under the child nodes that have no child nodes (what exactly is the node, would you please correct it for me?). as shown in the figure, the red box marks the child nodes that need to be obt...

encounters a javascript algorithm problem, which requires that find out all prime factors of a number algorithm I designed: function primeFactors(n){ var factors = []; var divisor = 3; if (n % 2==0) factors.push(2); while(n>5){ ...

recently, we are going to do a statistics on the activity of the industry in the project, and the three factors that affect the activity of the industry are the number of posts issued by the industry, the number of comments on the information of the indu...

there are two files, A.txt and B.txt. there are 3000w rows of data in A.txt. The contents separated by spaces between id and username are as follows: id usernmae 1 zhangsan 2 lisi ...... there are 3000w rows of data in B.txt. The contents sep...

Today on the data structure, the teacher said that there are four physical structures, sequential structure, chained structure, index and hash, but the book says that there are only sequential and chained structures. So who s right. ...

We know that the collections of the python built-in module has a lot of useful operations. for example: from collections import Counter -sharp -sharp top n user_counter = Counter("abbafafpskaag") print(user_counter.most_common(3)) -sharp[( ...

an algorithm for shopping cart, the general flow is: know the price and importance level of each item (1 to 5 are the most important). In the case of a limited amount, you can buy one or more goods, each with a quantity of 1, achieving the highest poi...

given a pointer p, how do I delete the node pointed to by a single linked list p? ...

there is a balanced binary tree. How to ensure balance by adding 2 new nodes? for example, the weights are as follows: 100, 92, 86, 56, 6, 10, 90 , how to build a balanced binary tree? ...

for example, an array: [235, 42, 8, 100] now you need to sort by last bit , and the final result should be: [100, 42, 235, 8] excuse me: how to achieve this function, what is needed is an algorithm < hr > Thank you for @ lejoy s advice. A simp...

1. Is there a fast grouping and merging algorithm? 2. Single-threaded merging is too slow. Will parallel merging greatly improve merging efficiency? 3. Any comments or suggestions are welcome. ...

for example, if you want to move from 0 to 100 1px at this speed, you can move x coordinates + 1 per frame. What if you want to move obliquely from 0 ~ 0 to 100 ~ ~ 20 at this speed? ...

Let the bullets be fired according to the direction of the mouse click, just like those who are good at fishing ...

the set of collections I now get through the mongoose query looks like this: [{ _id: "123456", sex: 0 },{ _id: "222222", sex: 1 },{ _id: "111111", sex: 1 },{ _id: "333333", sex: 0 ...

requires the number of generators to meet ^ [Amurz] {2} d {3} $ each generation is not repeated for example, 1000 are generated, 1000 are not repeated there is no need to remove duplicates such as arrays, it seems that the algorithm can directly gu...

find out how many zeros there are between 1 and 1 million ...

topic: ss for example: enter google, to find that the longest symmetrical string is goog enter abcda to find that the longest symmetric string is aba. if there is more than one longest symmetric string, multiple longest symmetric strings o...