Programmer Think

Main idea: For a polyline, each operation transforms all line segments of the polyline into the same shape as the polyline, and repeats d times. Ask at which point the f (0 ≤ f ≤ 1) times of the whole length from the beginning to the end will stop. Solutions: Assuming that the length of the broken line is k times of the original, the ...

[notice: All Rights Reserved. Please reprint. Do not use for commercial purposes. Contact email: feixiaoxing@163.com]When writing multithreads, it's very common to have one. That is, there are few opportunities for public data modification. Compared with rewriting, their chances of reading are much higher. Generally speaking, the process of rea ...

Ranking of data structure experiment 7: course selection list Time Limit: 1000MS Memory Limit: 65536KB Submit Statistic Problem Description With the expansion of the school scale, the number of students has increased dramatically, and the output of the course selection list has become a heavy task. At present, our school has more than 3000 ...

This article mainly introduces how to use the Cupertino style control of Flutter to write an iOS style address book, as well as the problems encountered in the process and solutions. When you write apps with Flutter, you will generally use material style controls. Because material style controls are rich, but they will appear Android flavor on ...

Author: Tang Youhua https://dzone.com/articles/a-birds-eye-view-on-java-concurrency-frameworks-1 1. Why to write this article When NoSQL became popular a few years ago, like other teams, our team was keen on exciting new things and planned to replace an application's database. However, when we go deep into details, we think of what a wise man ...

1. Functions 1.1 case conversion function function describe LOWER() All lowercase UPPER() uppercase INITCAP() title case 1.2 String Operating Functions function describe concat() Split String Substr (field, startIndex,endIndex) substr length() String Length Instr (field,'character') Location index where specified characte ...

Author: Lin Zelong 1 What is feature engineering? Excellent models often depend on excellent feature extraction, which involves feature engineering.The purpose of feature engineering is to maximize the extraction of features from raw data for use by algorithms and models.Therefore, feature engineering is mainly carried out in the aspect of feat ...

Current Limiting Algorithm Token Bucket Tokens are generated at a fixed rate and placed in the token bucket. When the token bucket is full, extra tokens are discarded; requests consume an equal proportion of tokens.When the token is not enough, the request comes and no token is received, and the request is denied service. Leaky buc ...

In the previous article, the blogger introduced a model reflecting the relationship between two variables, namely, one variable linear regression model. If there are several variables, then we need to use multiple linear regression model.First, import related modules and datasets: from sklearn import model_selection import pandas as pd import ...

This article starts with the put, get and remove methods of HashMap, and analyzes the source flow (specific algorithm of red black tree is not involved) The structure of HashMap in jkd1.8 is in the form of array, linked list and red black tree     (when the red black tree is not transformed)   (when converted to mangrove)   1, About th ...