🌐 Web Development: React, Next.js, PWAs & E-commerce solutions📱 Mobile Apps: React Native & Flutter for iOS/Android💻 Desktop Apps: Cross-platform Electron applications🍽️ RestaurantPOS Pro: Complete restaurant management system🛍️ RetailPOS Elite: Smart retail point of sale solution📋 WaitlistPro: Smart waitlist management platform🛠️ Developer Tools: Powerful SDKs, APIs & libraries for seamless integration🎯 Code Playground: Live JavaScript, Python & Java execution📚 Programming Academy: Interactive quizzes for 17+ languages⚙️ Backend & APIs: RESTful, GraphQL & microservices architecture🚀 DevOps: CI/CD pipelines, Docker, Kubernetes & cloud deployment🔧 App Management: Performance monitoring, security updates & maintenance🌐 Web Development: React, Next.js, PWAs & E-commerce solutions📱 Mobile Apps: React Native & Flutter for iOS/Android💻 Desktop Apps: Cross-platform Electron applications🍽️ RestaurantPOS Pro: Complete restaurant management system🛍️ RetailPOS Elite: Smart retail point of sale solution📋 WaitlistPro: Smart waitlist management platform🛠️ Developer Tools: Powerful SDKs, APIs & libraries for seamless integration🎯 Code Playground: Live JavaScript, Python & Java execution📚 Programming Academy: Interactive quizzes for 17+ languages⚙️ Backend & APIs: RESTful, GraphQL & microservices architecture🚀 DevOps: CI/CD pipelines, Docker, Kubernetes & cloud deployment🔧 App Management: Performance monitoring, security updates & maintenance

1. Two Sum

Easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice.

Difficulty:Easy

Problem 1

Examples:

Example 1:

Input: nums = [2,7,11,15], target = 9

Output: [0,1]

Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].

Example 2:

Input: nums = [3,2,4], target = 6

Output: [1,2]

Constraints:

•2 ≤ nums.length ≤ 10⁴
•-10⁹ ≤ nums[i] ≤ 10⁹
•-10⁹ ≤ target ≤ 10⁹
•Only one valid answer exists.

Two Sum