There are n people who want to carpool during m days. On day i, some subset ???? of people want to carpool, and the driver di must be selected from si . Each person j has a limited number of days fj they are willing to drive. Give an algorithm to find a driver assignment di ∈ si each day i such that no person j has to drive more than their limit fj. (The algorithm should output “no” if there is no such assignment.) Hint: Use network flow. For example, for the following input with n = 3 and m = 3, the algorithm could assign Tom to Day 1 and Day 2, and Mark to Day 3. Person Day 1 Day 2 Day 3 Driving Limit 1 (Tom) x x x 2 2 (Mark) x   x 1 3 (Fred)   x x 0

Computer Networking: A Top-Down Approach (7th Edition)
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There are n people who want to carpool during m days. On day i, some subset ???? of
people want to carpool, and the driver di must be selected from si . Each person j has
a limited number of days fj they are willing to drive. Give an algorithm to find a driver
assignment di ∈ si each day i such that no person j has to drive more than their limit fj. (The algorithm should output “no” if there is no such assignment.) Hint: Use network
flow.
For example, for the following input with n = 3 and m = 3, the algorithm could assign
Tom to Day 1 and Day 2, and Mark to Day 3.

Person Day 1 Day 2 Day 3 Driving Limit
1 (Tom) x x x 2
2 (Mark) x   x 1
3 (Fred)   x x 0

 

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