Programmer Group

Shortest path problem with loop First, construct the map: Firstly, a maze with multiple paths and rings is constructed. The idea is the same as the previous method of finding the shortest path of multi-path. We need to traverse all the footholds first and save the shortest path in the minimum path stack. Different f ...

Today's project, because of the use of spring asynchronous concurrent execution, this error occurred. And occasionally, especially when the project is just started, such problems may occur java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 3 at java.util.concurrent.FutureTask.report(FutureTask.java:122) ...

demand The demand is like this: for example, background statistics show a relatively large total amount, such as 90,000,000, or more than 900 million. Need to show on the page again: xxxxbillion xxx10,000 XXX yuan, Amount value for statistics: If it's a billion then it's xxx10,000 XXX yuan, If it's 0 yuan, it's XXXX billion xxx million If it i ...

Run the program, because of memory problems or other blabla blabla problems (not code problems altogether), the program may hang up occasionally, and we can't stare at the program all day. What can we do?It's a good idea to write a script to check if the program hangs up and restart if it does, depending on the operat ...

1. To judge whether each letter in a string is in another string, we can use the characteristics of the set to solve the problem. If the elements of the set exist, it is impossible to add the update to the set again. Then the length of the set is the same as before. If you add it, the length of the set will increase >>> a = 'ghost' ...

Background of topic Cut point Title Description In this paper, we give an undirected graph with n points and m edges, and find the cut points of the graph. I / O format Input format:   Input n,m in the first line In the following m lines, enter x for each line. Y means there is an edge between X and y   Output format:   Number of ...

Spring Boot druid configuration rely on Add druid dependency to Spring Boot project <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> To configure spring.datasource.url= spring.datasource.username= spring.datasour ...

JavaScript style operations include controlling the inline style of an element through the style attribute, getting the effective style of an element through the getComputedStyle method, changing the pseudo element style by changing the element class name, and animating the style through a timer style attribute DOM cannot manipulate CSS fil ...

public class A { private String a; private String b; public String getA() { return a; } public void setA(String a) { this.a = a; } public String getB() { return b; } public void setB(String b) { this.b = b; } } public class B extends A { private ...

Use of wrapper Gradle Wrapper is the recommended usage of gradle. This article will illustrate how to use it with specific examples. Gradle Wrapper The Gradle Wrapper is actually a script, which can be used to download and use the specified version of gradle. It can be downloaded before use as required, effectively avoiding environment consiste ...