第一题：
读题：
给定n个数，从中选出m个数，使得这些数中的最大值与最小值差最小
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思路：
先输入这些数据，再排序，这样能够保证连续的m个数中最大值与最小值之差尽可能小，再擂台找到这些的最小值
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代码：
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