Create Array Generator Service

Problem Overview

• Find the lexicographically largest sequence S in exactly m steps.
• Inputs: arr of positive integers, state string of '0'/'1' availability, and m; S starts empty.
• Each step, choose an available arr[i] to append; then blocked indices with a left available neighbor become available.
• Output: sequence S of length m; lexicographic order compares elements left to right.
• Real-world: array generator service for testers; an Amazon coding interview interview question/problem.