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Solution: Compilation Order

Explore how to apply topological sort to determine the correct order of compiling classes based on their dependencies. Learn to construct a graph, identify sources, and handle cycles for an efficient compilation sequence.

Statement

There are a total of nn classes labeled with the English alphabet (AA, BB, CC, and so on). Some classes are dependent on other classes for compilation. For example, if class BB extends class AA, then BB has a dependency on AA. Therefore, AA must be compiled before BB.

Given a list of the dependency pairs, find the order in which the classes should be compiled.

Constraints:

  • Class name should be an uppercase character.
  • 00 \leq
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