You are managing a build pipeline for a software project. The pipeline contains n components labeled 0 to n-1, connected by prerequisite relationships. Each relationship [u, v] means component v cannot start building until component u has finished. Each component takes exactly one time unit to build, and any components whose prerequisites are all complete may be built simultaneously.

A component is called a bottleneck if there exists a time step during which it is the only component being built (i.e., it runs entirely alone in its time slot). ...