The “Search in Rotated Sorted Array” problem involves finding a target value in a sorted array that’s been rotated at some unknown pivot. For instance, an array like [4,5,6,7,0,1,2] is a rotation of [0,1,2,4,5,6,7]. You’re given this rotated array and a target value; your goal is to determine the target’s…

The Maximum Product Subarray problem asks you to find the highest possible product from any sequence of consecutive numbers (or “subarray”) within a given list of integers. You’re not just looking for the largest single number, but rather the maximum product you can achieve by multiplying a series of numbers…

The threeSum problem is a classic question that aims to find all unique triplets in an array that add up to zero. Given an integer array nums, the goal is to return a list of lists where each list represents a unique triplet that satisfies this condition. Solving this problem…

The “Rotate Array” problem on LeetCode asks us to rotate an array of integers to the right by a given number of steps  k . This means each element in the array moves  k  positions to the right, with elements at the end wrapping around to the beginning. The challenge…

The LeetCode problem “Find Customer Referee” requires us to retrieve the names of customers who either have no referee or whose referee is not customer ID 2. High-Level Strategy To solve this problem: 1. Filter by Conditions: Use SQL’s WHERE clause to apply conditions that exclude customers with referee_id =…

The LeetCode problem “Recyclable and Low Fat Products” is a SQL problem where the object is to retrieve a list of products that are both recyclable and low fat from a database table. Each product has attributes indicating whether it is recyclable or low fat. Problem Objective Given a Products…

The LeetCode problem “3Sum Closest” asks us to find three numbers in an array that sum up to a value closest to a given target. For example, given an array nums = [-1, 2, 1, -4] and target 1, the three numbers closest to the target are [-1, 2, 1],…

In the “Subarray Sum Equals K” problem, you are given an array of integers and a target integer, k. The goal is to find the number of contiguous subarrays within the array that sum up to k. Think of it as searching for specific sections in the array where adding…

The LeetCode problem “Longest Common Prefix” requires finding the longest common starting sequence (prefix) among an array of strings. For example, given [“flower”, “flow” “flight”], the longest common prefix is “fl”. Algorithm and Data Structure Choice Chosen Algorithm: Vertical Scanning The vertical scanning technique checks each character position across all…