You're given build tasks and their dependencies. Tasks with no unmet dependencies can run in parallel. Write a function that returns the minimum number of rounds needed to finish everything, or reports that it's impossible.

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

You're given build tasks and their dependencies. Tasks with no unmet dependencies can run in parallel. Write a function that returns the minimum number of rounds needed to finish everything, or reports that it's impossible.

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