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Solution: Sort Items by Groups Respecting Dependencies

Explore how to arrange items by groups while respecting dependencies using a two-level topological sort approach. Understand item and group level ordering, manage cycles, and implement a hierarchical sorting algorithm to ensure valid orderings under constraints.

Statement

You are given nn items indexed from 00 to n1n − 1. Each item belongs to 00 or one of m groups, described by the array group, where:

  • group[i] ...