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In some country, there are n flights among n cities. Each city has an exactly one outgoing flight but may have no incoming flight or

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In some country, there are n flights among n cities. Each city has an exactly one outgoing flight

but may have no incoming flight or multiple incoming flights. Design an algorithm to find the

largest subset S of cities such that each city in S has at least one incoming flight from another

city in S. (hint: recall the in-degree array we used in developing the topological sort algorithm in

class)

2. In some country, there are n flights among n cities. Each city has an exactly one outgoing flight but may have no incoming flight or multiple incoming flights. Design an algorithm to find the largest subset S of cities such that each city in S has at least one incoming flight from another city in S. (hint: recall the in-degree array we used in developing the topological sort algorithm in class)

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