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这题为什么是求出凸包，然后判断凸包上每条边存在3个以上点，就可以了。看不懂题目，求大牛解答？？？？？？？？这题为什么是求出凸包，然后判断凸包上每条边存在3个以上点，就可以了。看不懂题目，求大牛解答？？？？？？？？ Followed by:
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