Programmer Group

1. Operator priority. What is the result of the following code? public class Test { public static void main(String[] args) { int k = 0; int ret = ++k + k++ + ++k + k; // What is the value of ret System.err.println(ret); } } Answer: mainly investigate the difference between + + i and i + +. ++In the first place, the v ...

prim: First, build a tree with only one node, which can be any node in the original graph Using an edge to expand the tree requires that one vertex of the edge is in the tree and the other vertex is not in the tree, and the weight of the edge is the minimum. Repeat step 2 until all vertices are in the tree Look at the teacher's template ...

Yes, I plagiarized this question from LZL's blog. His question is really good and fragrant. Title Link: http://poj.org/problem?id=2411 Main idea: for a rectangle of n * m, how many ways are there to fill the rectangle with 1 * 2 small squares. (1<=n, m <= 11)  Train of thought: 1. With the experience of problem-solving, I can thi ...

There is an infinite tree with roots. Each node has N children. The distance between each child and the parent node is di. Find the number of nodes whose distance from the root node is less than or equal to X   Idea: pay attention to the observation data range, each d[i] is less than or equal to 100, so we can set dp[i] to represent the numbe ...

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=1231 Problem Description: Given the sequence of K integers {N1, N2 , NK}, any continuous subsequence of which can be expressed as {Ni, Ni+1 , Nj}, where 1 < = I < = J < = K. The largest continuous subsequence is the element sum of all the continuous s ...

[1] linux 0.11 bootsect.s Copy the contents of the memory segment [0x07c00, 0x07e00) to the memory segment [0x90000, 0x90200], Then jump to 0x9000 segment to execute the program that is not executed after bootdetect. S. The subsequent program of bootsec. S will start the setup.s program in the disk (floppy disk) into ...

Spring integrates Mybtais with the following configuration (all roads lead to Rome, and the way is not unique). private static final String ONE_MAPPER_BASE_PACKAGE = "com.XXX.dao.mapper.one"; @Bean public MapperScannerConfigurer oneMapperScannerConfigurer() { MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); ...

Recently, I am working on a project, which involves file download and package compression download. Single file download is relatively simple. Multi file download involves package and compression knowledge, which I haven't done before. Write a blog to make a simple record. Less gossip, code: The fol ...

brief introduction ArrayList is a dynamic array based on array. Its capacity can grow automatically. It is similar to the dynamic application memory and dynamic growth memory in C language. ArrayList is not thread safe and can only be used in a single thread environment. In a multi-threaded environment, you can consider using the collections. ...

while loop sentences and exercises In Python programming, the while statement is used to execute a program circularly, that is, under certain conditions, to execute a certain program circularly to handle the same tasks that need to be handled repeatedly. Its basic form is: while judgment condition: execute statement... The execute statement ca ...