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此题没要求围墙必须是凸的吧?那对于凹多边形,应该出现凹进去的围墙啊???难道不是这样?9 100 200 400 201 400 201 300 499 300 499 400 500 400 500 200 350 200 200 200 这组数据的结果按照大家的方法,就是1628, 但是,很明显中间部分凹了很大一块进去, 以至于围墙也可以凹进去一部分,从而使周长更小啊! 我哪里思考错误了,求各位指点! Followed by:
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