Subset With Min Diff


https://gist.github.com/gcrfelix/1fd8be268c1442d689bf
给一个array 和一个size k 找到⼀个size k subset ，并且保证最大和最小的数相差最⼩
解法：用一个maxheap和minheap同时记录每k个元素里的最小值和最大值
http://www.themianjing.com/2015/08/818-google%E7%94%B5%E9%9D%A2/
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