Antar Das Antardas

MQTT (Message Queuing Telemetry Transport)

MQTT is a lightweight publish/subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks. It's the backbone of many IoT applications.

Core Concepts

1. Publish/Subscribe Model

Two Sum - LeetCode Problem #1

Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. You may assume each input would have exactly one solution.

Example:

Input: nums = [2, 7, 11, 15], target = 9
Output: [0, 1]
Explanation: nums[0] + nums[1] = 2 + 7 = 9

Group Anagrams - LeetCode Problem #49

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

Problem Understanding

An anagram is a word formed by rearranging the letters of another word (e.g., "eat", "tea", "ate" are all anagrams).

Example:

VSCode - ESLint, Prettier & Airbnb Setup for Node.js Projects

1. Install ESLint & Prettier extensions for VSCode

Optional - Set format on save and any global prettier options

2. Install Packages

npm i -D eslint prettier eslint-plugin-prettier eslint-config-prettier eslint-config-airbnb-base eslint-plugin-node eslint-config-node

Setup Eslint Prettier and Husky in Node JS Typescript Project

1. ESLint

Step 1 - Install the dependencies
- eslint
  - ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code.
  - npm install --save-dev eslint
- typescript-eslint/parser

	version: '3'

	services:
	redis:
	image: redis:latest
	container_name: docs-cache
	restart: on-failure
	ports:
	- 6379:6379
	volumes:

	#include <bits/stdc++.h>

	using namespace std;
	const int N = 1e5;
	vector<int>adj_list[N];
	int visited[N], inDegree[N];
	int n, m;


	bool detect_cycle(int node) {