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Minimum Boats to Carry Everyone

题目

Five people weighing 50, 50, 70, 80, and 90 kilograms must cross a lake. Each boat can carry at most two people and at most 140 kilograms total. Assume you have as many boats as you like, all departing together, so you only care about how many boats are required (not return trips). What is the minimum number of boats needed so that everyone can cross?

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