A list of projects and a list of dependencies, or a list of project pairings where the second project depends on the first project, are provided to you. Before starting a project, all of its dependencies must be built. Find a build order that enables the construction of the projects. Return an error if there is no proper construction order. EXAMPLE Input: projects: a, b, c, d, e, f dependencies: (a, d), (f, b), (b, d), (f, a), (d, c) Output: f, e, a, b, d, c

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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A list of projects and a list of dependencies, or a list of project pairings where the second project depends on the first project, are provided to you. Before starting a project, all of its dependencies must be built. Find a build order that enables the construction of the projects. Return an error if there is no proper construction order.

EXAMPLE
Input:
projects: a, b, c, d, e, f
dependencies: (a, d), (f, b), (b, d), (f, a), (d, c)
Output: f, e, a, b, d, c 

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