ACMer    What is Tetration Operator in Math Tetration is an operation in mathematics that involves iterated exponentiation. It is part of the sequence of hyperoperations that extend beyond addition, multiplication, and exponentiation. In tetration, a number is raised to the power of itself repeatedly a...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Here’s a step by step tutorial on how to convert an array to a linked list and vice versa in Python. This can be useful for different scenarios where you need to change data structures based on specific use cases, such as memory...

ACMer    The Matthew Effect is a sociological and economic phenomenon that describes how the rich get richer and the poor get poorer. This concept originates from a passage in the Gospel of Matthew in the New Testament: For to everyone who has, more will be given, and they will have an abundance; but...

ACMer    First TikTok London Interview Four years ago, in December , I applied for the System Engineer position at TikTok London. At that time, the TikTok team in London was being established, and the engineer who interviewed me was from Beijing. The first round was mainly a background check. They went...

ACMer    Docker vs. Virtual Machines VMs Overview: Both Docker and VMs are used for deploying and running applications in isolated environments, but they do so differently. Docker Containers Lightweight: Containers share the host OS kernel, making them more lightweight and faster to start up than VMs....

ACMer    One interesting use case for ChatGPT is its ability to assist in reviewing code in a Pull Request, which can be incredibly beneficial. By pasting the code into ChatGPT and asking for a review, it can identify potential issues and offer suggestions to enhance the overall quality of the code. However...

ACMer    I’ve recently got an invitation email from a Meta Recruiter about a Staff Enterprise Engineer role in Meta London: What is Enterprise Engineer in Meta An Enterprise Engineer at Meta focuses on designing, developing, and maintaining the internal tools and systems that help the company’s employees...

ACMer    Note: recently this has been asked in the first round of the technical interviews by Tiktok Bytedance for a Site Reliable Engineer role in London. TCP IP Protocols is a fundamental concept in Computer Networking Computer Science , which every Software Engineer should be faimilar with. TCP IP ...

ACMer    This is one of the most frequently asked interview questions for Software Engineer roles. In C C, memory management is a critical aspect of controlling how a program allocates and manages its resources. The memory in a C C program is typically divided into different areas: stack and heap being...

ACMer    I think this is one of the most popular interview questions for Software Engineering Positions. Recently it has been said this has been asked in one of the Tiktok Interview. To answer the question What happens when you type https: www.google.com in the browser in a detailed and structured...

ACMer    When most people hear the word blockchain, they instantly think of cryptocurrencies like Bitcoin and Ethereum. While crypto has garnered the lion’s share of attention, it’s important to recognize that it’s just one application of the underlying technology: blockchain. Imagine an iceberg floating...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms You are given a positive integer n. A binary string x is valid if all substrings of x of length contain at least one . Return all valid strings with length n, in any order. Example : Input: n Output: Explanation: The...

ACMer    The SUMIF function in Excel allows you to sum the values in a range that meet a specific condition criterion . Here’s the basic syntax: SUMIF range, criteria, range The range of cells that you want to apply the condition to. criteria The condition that must be met. It can be a number,...

ACMer    memcmp is a standard library function in C and C that compares two blocks of memory byte by byte. It’s declared in the header in C and the string.h header in C. Syntax of memcmp int memcmp const void ptr , const void ptr , size t num ; Parameters of memcmp ptr : Pointer to the first block...

ACMer    The Network Time Protocol NTP can be installed via: sudo apt install ntp The configuration for the NTP server time synchronization is located at: etc ntp.conf. In Network Time Protocol NTP , the minpoll and maxpoll settings control the minimum and maximum intervals between polling requests to...

ACMer    Many major tech companies, including FANG Facebook Meta, Apple, Netflix, Google and Microsoft, require multiple rounds of interviews before extending a job offer. These typically include coding, system design, and behavioral assessments to evaluate cultural fit. I’m offering minute mock...

ACMer    P, NP, NP hard, and NP complete are key concepts in computational complexity theory, which helps us classify problems based on how hard they are to solve. Here’s a breakdown: P Polynomial Time P represents the class of problems that can be solved efficiently by a deterministic algorithm, meaning...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Example: Find the integer cubic root of a First of all, we need to find out how many digits of a, which is easy to find out. a is a digit number since is between and . Also, the digit at One is,...

ACMer    When you are writing C code, especially on your interviews, you want to impress the interviewer with the modern C features. Modern C introduces several powerful features, including algorithms like std::transform and std::for each, which leverage functional programming paradigms for concise...

ACMer    In C, both push back and emplace back are methods of the std::vector class used to add elements to the end of the vector, but they have some differences in how they handle the elements. push back Usage: push back const T value or push back T value Behavior: This method copies or moves the...

ACMer    Note: I have been asked this question by a Google Recruiter in the early stage of Interview Process e.g. Screening. In C, when you access a non existent key in std::map, the behavior depends on how you access it: Using the subscript operator If the key does not exist, std::map will automatically...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Given two integers, num and t. A number is achievable if it can become equal to num after applying the following operation: Increase or decrease the number by, and simultaneously increase or decrease num by . Return the maximum...

ACMer    In C, both list and vector are container classes provided by the Standard Template Library STL . However, they differ in several key aspects, such as their underlying data structures, performance characteristics, and use cases. Here’s a comparison: Underlying Data Structure vector: Implemented...

ACMer    In , I took the college entrance exam and then spent the summer in Beijing. In September, I enrolled at the International College at Beijing ICB of China Agricultural University. However, I was admitted through a self funded program since my entrance exam score wasn’t high enough to secure a...

ACMer    The statement Backtracking DFS Pruning is a concise and intuitive description of the backtracking algorithm. To understand this, let’s break down the key concepts in this equation. Depth First Search DFS Algorithm DFS is an algorithm for traversing graphs or trees. It starts from the root...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms You are given a string s. Simulate events at each second i: If s E’, a person enters the waiting room and takes one of the chairs in it. If s L’, a person leaves the waiting room, freeing up a chair. Return the minimum...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms You are given an integer array nums. In one move, you can pick an index i where i nums.length and increment nums by . Return the minimum number of moves to make every value in nums unique. The test cases are generated so...

ACMer    A simple yet effective hash function for strings is the well known djb algorithm by Daniel J. Bernstein. It is simple to implement and has good performance characteristics for many use cases. C djb Hash Function Here is the implementation of the djb hash function in C : include iostream ...

ACMer    My Microsoft Surface Laptop Studio becomes extremely laggy, slow, and nearly unusable in hot weather. Restart didn’t help and after a slow reboot, I managed to open the Windows Task Manager and surprised to see that the CPU frequency is throttled. The high CPU temperature causes it to throttle ...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms You are given a string s. Your task is to remove all digits by doing this operation repeatedly: Delete the first digit and the closest non digit character to its left. Return the resulting string after removing all digits. Example...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Table: Tree Column Name Type N int P int N is the column of unique values for this table. Each row includes N and P, where N represents the...

ACMer    The apache server logs the access requests in var log apache so we can analyse this log file to find out the last few requests. The following parses the apache server logs, and print the requests line by line. It is based on the BASH commands: awk and tail. bin bash NUMBER OF REQUESTS LOG...

ACMer    The following two features when enabled are the performance killer on Windows . As we navigate the intricacies of our Windows operating systems, ensuring optimal performance and safeguarding our privacy are top priorities. One way to achieve this is by tweaking a few essential settings,...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Apple Redistribution into Boxes You are given an array apple of size n and an array capacity of size m. There are n packs where the ith pack contains apple apples. There are m boxes as well, and the ith box has a capacity of...

ACMer    I have seen such transactions of small amounts on both TRON and ETH blockchains. This transaction shown below in the tron scan blockchain explorer is suspected to be an attack from an account with the same ending characters as that of the user’s account. Please be cautious of such scams. What are...

ACMer    From to , I worked as a Software Development Engineer SDE at Amazon AWS Amazon Web Services . Some say SDE stands for Someone Does Everything, and that’s quite accurate. Every SDE at Amazon is responsible for their code from design to testing and must also handle on call duties...

ACMer    HTX Crypto Exchange has a range of different DeFi Products De centralised Finance and Flexi Max is one of the interest ones. TLDR; you can transfer your Crypto coins e.g. USDT and subscript to Flexi Maxi product. After subscription, you can withdraw your funds at any time, however, different...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Previously: Teaching Kids Programming Introduction to SQL and the SELECT We can visualize the Different Types of Joins using the Venn Diagrams, for example, the Inner Joins can be seen as finding the common intersecting parts of...

ACMer    In GoLang, the defer keyword is used to ensure that a function call is performed later in a program’s execution, typically for purposes of cleanup. Deferred function calls are executed in last in first out order just before the surrounding function returns. This makes defer especially useful for...

ACMer    Previously, I was scammed about USDT because I clicked a phishing link that I shouldn’t have. A lesson learned: The Major Security Flaws of Wirex WirexApp Exchange In the world of cryptocurrencies, security is paramount. While the decentralized nature of blockchain offers robust protection...

ACMer    Use: ZHIHUA for additional discount when you purchase a Keychron keyboard here. I have been in love with the keychron keyboards for years. And recently I have purchased another Keychron keyboard: Keychron K Wireless Mechanical Keyboard US ANSI Layout à I also have a C Keychron Full...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Table: Tree Column Name Type N int P int N is the column of unique values for this table. Each row includes N and P, where N represents the...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms You are given a D boolean matrix grid. Return an integer that is the number of right triangles that can be made with the elements of grid such that all of them have a value of . Note: A collection of elements of grid is a...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Introduction to the Function Decorator in Python In Python, we can add decorate a function by using the symbol, following by the decorator. For example: def sample decorator func : def wrapper n : print Before ans func n ...

ACMer    This post writes a go version of caching layer using redis, wrapps it in a class and provides a usage. Let’s create a Go package that provides a caching layer using Redis. We’ll use the popular go redis redis v package to interact with Redis. We’ll define a Cache struct with methods to set and get...

ACMer    Recently, I have seen my servers overloaded High CPU Usage and I looked into the apache logs and I see the access logs from ChatGPT Bot aka GPTBot . and Bytedance Bots aka Bytespider. You can check the top IPs that access your server via the following BASH command: bin bash awk ’ a END...

ACMer    Beware of the Wirex Crypto Phishing Email Scam: I Lost GBP worth of USDT I have been a victim of a scam yesterday and I lost about USDT Crypto token worth of GBP due to opening a phishing email on the phone and had my phone number verified . I was doing some housework, and I...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Implement the Pairwise Function in Python using the Iterator Yield The pairwise is from itertools where we can iterate over a iterable list array, tuple, set, dictionary, string and etc in Python, and then returns an iterator to...

ACMer    Teaching Kids Programming: Videos on Data Structures and Algorithms Apple Redistribution into Boxes You are given an array apple of size n and an array capacity of size m. There are n packs where the ith pack contains apple apples. There are m boxes as well, and the ith box has a capacity of...

ACMer    In Rust programming, Cargo is a package manager and build system. It’s used for managing your Rust project’s dependencies, building your project, and managing its distribution. Cargo relies on two main files to manage these tasks: Cargo.toml and Cargo.lock. What is Cargo.toml This is the manifest...