1/30 Days of Data Structure and Algorithm

Day 1

Title: Finding index that sums to a target in JavaScript (Four Method)

Introduction

This post explains four approaches for solving the classic algorithm problem: finding two indexes in an array that add up to a given target. We'll cover methods for both unsorted and sorted arrays:

• Brute Force (Unsorted)


• Hash Map (Unsorted)


• Binary Search (Sorted)


• Two Pointers (Sorted)

We'll analyze their time complexities and discuss their suitability for different scenarios.

The Problem:

Given an array of numbers (numberList) …

algorithm algorithms array arrays brute data datastructures hash index introduction javascript map problem structure target