LeetCode 462 Minimum Moves to Equal Array Elements II

问题：给出一个数组，每次可以从中选择一个数+1或者-1，使得数组中的所有元素相等，要求操作次数最少。

思路：假设元素分别为x1,x2,...,xn,元素最终等于x，则要求|x1-x|+|x2-x|+...+|xn-x|最小。先求出中位数，然后求和得到最少操作次数。

代码参考：

https://github.com/wuli2496/OJ/tree/master/LeetCode/462%20Minimum%20Moves%20to%20Equal%20Array%20Elements%20II

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