Launch order

Coding round. A launch is a set of steps with prerequisites. Clarify that you will return one order, not every order. Implement it. Then the interviewer adds an edge that points back at an earlier step and asks you to stop and report the cycle instead of guessing an order. Then they ask which step you would delay if two ready steps take the same time. State the rule you already used for ties, and say what you would measure if the graph were large. Example first, then code.