ok, but

回答: good question and bad question火球魔法2008-10-09 15:45:22

First of all, my solution is better

Second of all, I proved it to be optimal, strictly

Third of all, I gave a family of solutions and

Last of all, after reading KangMM's solution, I identified that her optimal conditions are over strict, in that it is not necessary when the car is moving ahead, it has to carry 3 people as much as possible.

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