## ExpandableListView easy to use

The simple use of expandable listview in Android, taking a demo as an example, is relatively simple, mainly used to understand some conceptual knowledge. As learning notes only.
1. Definition: Extensible ListView.
public class ExpandableListView extends ListView {
......
}
Inherited from ListView, so the basic usage method is the s ...

Posted on *Thu, 17 Oct 2019 13:40:55 -0700* by **rilitium**

## HNOI2008 Mingming's troubles

In fact, it's hard to understand prufer.
First of all, we know that there are at most n-2 points in the prufer sequence, and the number of other points that know the degree is di-1. We define the number of remaining points in the prufer sequence sum=n-2 - ∑ (di-1). I n this way, we can approximate the number of times that we have known all ...

Posted on *Thu, 17 Oct 2019 13:29:13 -0700* by **callesson**

## User information display after accessing treasure net

golang crawled to treasure net, crawled to 30000 multi-user information, coexisted in elastic search, as shown in the figure below, and inquired 30000 multi-user information.
Let's look at the end result:
Using the html template library of go language:
Perform template rendering:
func (s SearchResultView) Render (w io.Writer, data model.Searc ...

Posted on *Thu, 17 Oct 2019 12:43:53 -0700* by **kazuki**

## The first HDU6578 Blank in 2019HDU multi school

http://acm.hdu.edu.cn/showproblem.php?pid=6578
There are n spaces in a row. The spaces from left to right are 1, 2,... N.
Tom is filling in each space with a number in {0,1,2,3}. In his opinion, the following M conditions must be met. The ith condition is:
There are xi different numbers in the spa ...

Posted on *Thu, 17 Oct 2019 12:23:57 -0700* by **sasito**

## The first E ABBA in 2019

Title Link: https://ac.nowcoder.com/acm/contest/881/E
The main idea of the topic
Ask how many strings of (n + m) A's and (n + m) B's can be divided into (n + m) subsequences of length 2, in which there are exactly n "AB" and M "BA".
Analysis 1 (DP)
The code is as follows
Analysis 2 (broken line method of catt ...

Posted on *Thu, 17 Oct 2019 11:53:58 -0700* by **mingmangat**

## Source code analysis of java thread pool ThreadPoolExecutor

First, put the reference link, blogger analysis is more detailed: https://fangjian0423.github.io/2016/03/22/java-threadpool-analysis/
1. First of all, we must be clear about these constants. The main idea is to use an int type to represent the status and number of thread pools, the high three bits of int to represent the status, and the low 29 ...

Posted on *Thu, 17 Oct 2019 11:44:41 -0700* by **scottlowe**

## Sword finger Offer programming problem (Java implementation) -- repeated numbers in array

Title Description
All numbers in an array of length n are in the range of 0 to n-1. Some numbers in the array are repeated, but I don't know how many are. I don't know how many times each number is repeated. Please find any duplicate number in the array. For example, if the input length is 7 array {2,3,1,0,2,5,3}, the corresponding output is t ...

Posted on *Thu, 17 Oct 2019 11:24:42 -0700* by **JeditL**

## Getting started with Python crawler [15]: image capture of omelette Xoo

Today, I wrote a website of fried egg, which is very popular with reptilians, http://jandan.net/ooxx. In fact, this website is a little interesting. Many people on the website have written more than N tutorials in various ways. Of course, under the constant attack of reptilians, the website itself is co ...

Posted on *Thu, 17 Oct 2019 11:16:54 -0700* by **r.smitherton**

## Solution to the problem of NOIP2017 improvement group

Unconsciously, NOIP is slowly coming.
Recently, I will start to brush some questions similar to the difficulty of NOIP.
I have done the problem of NOIP2017 in my spare time. I feel that it is obvious to distinguish the difficulty of NOIP2018d2...
d1t1 Xiaokai's doubts
Not much, conclusion \ (a * b - a - b \).
Code slightly.
Time complexity of d ...

Posted on *Thu, 17 Oct 2019 11:03:11 -0700* by **mkarabulut**

## [Python] omelette XXOO image capture

Today, I wrote a website of fried egg, which is very popular with reptilians, http://jandan.net/ooxx. In fact, this website is a little interesting. Many people on the website have written more than N tutorials in various ways. Of course, under the constant attack of reptilians, the website itself is co ...

Posted on *Thu, 17 Oct 2019 10:32:38 -0700* by **eabigelow**