Tag：positive integer
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Time：2021-8-16
Finding prime pairs Goldbach guesses that everyone knows something. We don’t want to prove this conclusion now, but want to take out an even number arbitrarily from the number set that can be expressed in the program language to find two prime numbers so that the sum is equal to the even numberIf this fact […]
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Time：2021-8-14
1 document purposeThis document describes the installation and use of MySQL backup tool.2 installation and operation instructions2.1 functionsBackup the MySQL database every day.This job has two different scripts. You only need to select one of them:1. Mysqlbak.sh corresponds to the environment where the MySQL database has been installed and the mysqldump command can be used. […]
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Time：2021-6-21
1. Input a positive integer target and output all the continuous positive integer sequences (at least two numbers) whose sum is target. The numbers in the sequence are arranged from small to large, and different sequences are arranged from small to large according to the first number. Example 1: Input: target = 9 Output: [[2,3,4], […]
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Time：2021-6-9
Given a binary array, calculate the maximum number of consecutive 1. Example 1: Input: [1,1,0,1,1,1] Output: 3 Explanation: the first two digits and the last three digits are consecutive ones, so the maximum number of consecutive ones is 3 be careful: The input array contains only 0 and 1. The length of the input array […]
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Time：2021-6-5
Given a positive integer num, write a function that returns true if num is a complete square, otherwise returns false. Note: do not use any built-in library functions, such as sqrt. Example 1: Input: 16 Output: true Example 2: Input: 14 Output: false Problem solving code /** * @param {number} num * @return {boolean} */ […]
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Time：2021-3-27
Title Description For a natural number n, if the number N1 obtained by inversing the digits of n is equal to N, then n is called palindrome number, such as 2332.If given an n (2 < = n < = 16) base number m (the length of M is less than 100 bits), if M […]
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Time：2021-2-25
Example: missing first positive number Source: leetcode Link:https://leetcode-cn.com/probl… In situ hash Example: Missing first positive number Difficulty: hard describe To give you an unsorted integer array, please find the smallest positive integer that does not appear in it. Examples Example 1: Input: [1,2,0] Output: 3 Example 2: Input: [3, 4, – 1, 1] Output: 2 […]
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Time：2021-2-18
Java introduction classic examples (1) 1、 According to the age, the people who print out the current age are teenagers (below 18), young people (19-28), middle-aged (29-55) and old people (above 56).Upper code `import java.util.Scanner; public class TextDemo { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println (“please enter the age […]
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Time：2021-2-8
//Nonzero positive integers var num1 = /^+?[1-9][0-9]*$/; //Positive integer + 0 var num2 = /^d+$/; //Positive number var num3 = /^d+(?=.{0,1}d+$|$)/; //Amount format var moneyReg = /(^[1-9]([0-9]+)?(.[0-9]{1,2})?$)|(^(0){1}$)|(^[0-9].[0-9]([0-9])?$)/; Keep updating
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Time：2021-1-13
For more articles, please pay attention to the official account of “BLOG of the sea”. Question: The sum of Squares Theorem is also called Lagrange theoremEvery positive integer can be expressed as the sum of squares of up to four positive integers.If 0 is included, it can be expressed as the sum of the squares […]
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Time：2021-1-3
introduce Validate.Net With the help of Validate.js Net server data verification plug-in is developed based on the idea of. Net, which can more conveniently and efficiently verify whether the attribute value in the entity is legal. There are many regular data checking rules in the built-in (length of the string, the maximum and minimum length […]
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Time：2020-12-20
Recently, I’m learning shell programming, through MOOCSLearn Shell Scripting with 360 ArchitectsSo I type out some examples in the course and record them here. We will continue to write some script examples to play with. Example 1:The variable string =’bigdata process framework is Hadoop, Hadoop is an open source program ‘. After executing the script, […]
