Compilation Order

Try to solve the Compilation Order problem.


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.


  • Class name should be an uppercase character.
  • 00 \leq dependencies.length 676\leq 676
  • dependencies[i].length =2= 2
  • All dependency pairs should be unique.


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