C++ Py3用nth_element, nsmallest解Leetcode 3010 Divide an Array Into Subar...

C++ Py3用nth_element, nsmallest解Leetcode 3010  Divide an Array Into Subarrays With Minimum Cost I

問題簡單，但應該是同類問題入門，先提供幾個簡易解答

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