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Git Cheat Sheet with 40+ commands & concepts

By Md Shoriful Islam
Git Cheat Sheet with 40+ commands & concepts Tired of memorizing git commands? Here is a cheat sheet with 40+ commands to simplify your life. 1. Initialize a local repository git init <directory> The <directory> is optional. If you don't specify it, the current directory will be used. 2. Clone a remote repository git clone <url> 3. Add a file to the staging area git add <file> To add all files in the current directory, use . in place of <file>. git add . 4. Commit changes git commit -m "<message>" If you want to add all changes made to tracked files & commit git commit -a -m "<message>" # or git commit -am "<message>" 5. Remove a file from the staging area git reset <file> 6. Move or rename a file git mv <current path> <new path> 7. Remove a file from the repository git rm <file> You can also remove it from staging area only using --cached flag git rm --cached <file>
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C++ ios Library - Boolalpha Function

By Md Shoriful Islam
 C++ ios Library - Boolalpha Function Description It is used to sets the boolalpha format flag for the str stream. When the boolalpha format flag is set, bool values are inserted/extracted by their textual representation: either true or false, instead of integral values. Declaration Following is the declaration for std::boolalpha function. ios_base& boolalpha (ios_base& str); Parameters str − Stream object whose format flag is affected. Return Value It returns Argument str. Exceptions Basic guarantee − if an exception is thrown, str is in a valid state. Data races It modifies str. Concurrent access to the same stream object may cause data races. Example In below example explains about std::boolalpha function.  Live Demo #include <iostream>      int main () {    bool b = true;    std::cout << std::boolalpha << b << '\n';    std::cout << std::noboolalpha << b << '\n';    return 0; } Let us compile and run the above program
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C++ complete roadmap

By Md Shoriful Islam
C++ complete roadmap # programming # tutorial # beginners # cpp Let's jump in! If you are a beginner I will suggest you make a timetable of at least 45 days which will be sufficient in order to get a really good understanding of C++. Now, you can break your 45 days into 6 weeks and start with the concepts. 1st Week : Now, these seven days will introduce you to something that you have no previous knowledge of. So make sure you understand the foundations well and give a kickstart to the world of programming. What is C++? It’s history and features. Understanding and writing our first Hello World program in C++. Tokens Variables, Datatypes. Keywords How to take input from the user? Operators Arithmetic Operators. Logical Operators. Relational Operators. Other operators. Selection Statements if statements if-else else-if switch 2nd Week : Now you have understood the basic units of a program well. Its time to take a step forward. So, schedule yourself to learn the following topics. Loops
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Solution of Codeforces Round #831 (Div. 1 + Div. 2) || Tutorial of Codeforces Round #831 (Div. 1 + Div. 2)

By Md Shoriful Islam
Solution of Codeforces Round #831 (Div. 1 + Div. 2) || Tutorial of Codeforces Round #831 (Div. 1 + Div. 2) Codeforces Round #831 (Div. 1 + Div. 2, based on COMPFEST 14 Final) Editorial 1740A. Factorise N+M Author:  Pyqe Developer:  Pyqe Tutorial 1740A - Factorise N+M There are multiple solutions for this problem. We will discuss two of them. One solution is to choose  m = n m = n . This always guarantees that  m m  is prime, because  n n  is always prime. And we can see that  n + m = n + n = 2 n n + m = n + n = 2 n , which is always not prime, because  n > 1 n > 1  always holds. Another solution is to choose  m = 7 m = 7 . If  n n  is odd, then  n + m n + m  will be an even number greater than  2 2  and therefore not prime. Otherwise  n n  is even. The only even number prime number is  2 2  and it can be verified that  2 + 7 = 9 2 + 7 = 9  is not a prime number. Time complexity for each test case:  O ( 1 ) O ( 1 ) 1740B. Jumbo Extra Cheese 2 Author:  Pyqe Developer:  errorgorn , 
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403. Scientific Problem - C++ / C - Solution - Codeforces ACMSGURU problemset

By Md Shoriful Islam
403. Scientific Problem Time limit per test: 0.25 second(s) Memory limit: 65536 kilobytes input: standard output: standard Once upon a time Professor Idioticideasinventor was travelling by train. Watching cheerless landscape outside the window, he decided to invent the theme of his new scientific work. All of a sudden a brilliant idea struck him: to develop an effective algorithm finding an integer number, which is x times less than the sum of all its integer positive predecessors, where number x is given. As far as he has no computer in the train, you have to solve this difficult problem. Input The first line of the input file contains an integer number x (1 ≤ x ≤ 109). OutputOutput an integer number — the answer to the problem. Example(s) sample input sample output 1 3 sample output 2 5 Solution Code: C++ #include <iostream> using namespace std ; // solved int main () { int x ; cin >> x ; cout << 2 * x + 1 << endl ; return 0 ; } Solu
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Version Control with Git: A Beginner’s Guide

By Md Shoriful Islam
Version Control with Git: A Beginner’s Guide If you are a developer, you probably know how important it is to keep track of your code changes and collaborate with other developers on a project. But how do you do that effectively and efficiently? The answer is version control. Version control is a system that records changes to a file or set of files over time so that you can recall specific versions later. It allows you to revert files back to a previous state, compare changes over time, see who last modified something, and more. Version control also enables you to work with other developers on the same code base without stepping on each other’s toes. One of the most popular version control systems in the world is Git. Git is a free and open source distributed version control system that is designed to handle everything from small to very large projects with speed and efficiency. Git has many features that make it superior to other version control systems, such as: Cheap local branchin
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Callback function in JavaScript

By Md Shoriful Islam
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Callback function in JavaScript What is a callback function in JavaScript? A callback function is a function that is passed as an argument to another function and is executed after the first function has completed its task. Callback functions are useful for handling asynchronous events, such as network requests, file operations, or timers. For example, you can use a callback function to display the result of a calculation after the calculation is done. Callback function in JavaScript Here is a simple example of a callback function in JavaScript: // Define a function that takes a callback as an argument function sayHello (callback) { // Do some task console .log ("Hello, world!"); // Invoke the callback function callback (); } // Define another function function sayGoodbye () { // Do some task console .log ("Goodbye, world!"); } // Call the first function and pass the second function as a callback sayHello (sayGoodbye); // The output will be: // Hello, wo
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