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Data analysis case sharing, for learning and use, data volume is relatively small, data source for the hook, July 8th, area, data analysis post, is so little, yes. demand The crawled data were cleaned and further analyzed by python. tool python3,pycharm Data cleaning First analyze the target file ...

Procedures are good or bad: The first principle is: Speed up The second principle is: less memory The third principle is: data should be small There are several ways of timing programs 1) clock() function of C++, header file is time.h This timing method is based on the CPU clock as the timing unit, also ...

Because the ByteBuffer provided in JDK can not be dynamically expanded and the API is complex to use, Netty provides ByteBuffer. The API of Bytebuf is more convenient and can be expanded dynamically. It provides a variety of implementations of Bytebuf and an efficient zero-copy mechanism. Operation of ByteBuf ByteBuf has three important attribu ...

I. Dictionary Definition Dictionary is another variable container model and can store arbitrary types of objects. Each key value pair of a dictionary is separated by a colon (:), and each pair is separated by a comma (,), and the whole dictionary is included in curly brackets ({}). Keys must be unique, but values need not be; values can take an ...

Title Description Judging whether two sequences are the same binary search tree sequence Input Description: Beginning with a number n, (1 <= n <= 20) means there are n judgements to be made, and the input ends when n= 0. The next line is a sequence with a length less than 10 and contains (0-9) ...

T1 Dynamic Inverse Sequence Pair subject [Title Description] This paper gives a permutation a with length n (the number of N occurs once in each sequence). Exchange two numbers at a time to find the result of the inverse logarithm% 2. Inverse order pair: for two numbers a[i],a[j] (i < j), if a [i] > a [j], then (a[i],a[j]) is an inver ...

concept ArrayList is a dynamic array whose capacity can grow dynamically Inheritance diagram: Source code Let's look at it from the source code point of view: public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable{ //Default capacity size private ...

On-line problem solving is relatively small, and I have been studying it for half a day, hoping that it will be helpful to people who are looking for solutions. Topic link: https://codeforc.es/contest/1201/problem/D Topic: Give you a rectangle with a starting point at (1,1). If you have treasures in a given coordinate, you need to take all th ...

Parent component Define table headers and table contents data(){ return{ // Tabular data tableColumns: [], // Header data titleData:[], } } Introducing and registering subcomponents import TableComponents from "../../components/table/table"; //Register subcomponent table components: { tableC: TableComponents }, Get ta ...

General meaning Given a sequence of powers with length of 2, where a I < 10, the adjacent two numbers are merged into (a[i]+a[i+1])%10 at a time. If a [i]+a [i+1]>= 10, value plus 1. This will halve the length of the sequence. Now let's ask M what the total value is when the [L, R] interval is m ...