C++ Python公式推導Prefix sum解Leetcode 1685 Sum of Absolute Differences in a...

C++ Python公式推導Prefix sum解Leetcode 1685  Sum of Absolute Differences in a Sorted Array

對於會用Σ處理公式的，Leetcode 1685. Sum of Absolute Differences in a Sorted Array這應算是Bill Gates口中簡單的數學，

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python code請進

C++ python 迴圈累加解Leetcode垃圾車問題2391 Minimum Amount of Time to Collect Gar...

C++ python 迴圈累加解Leetcode垃圾車問題2391  Minimum Amount of Time to Collect Garbage。Leetcode垃圾車的問題根本是閱讀測驗，

C++頻率分析解Leetcode 1887 Reduction Operations to Make the Array Elements Equal

C++頻率分析解Leetcode 1887 Reduction Operations to Make the Array Elements EqualLeetcode這個週末的兩題都能用frequency  count，即所謂的counting sort來解題，如1887. Reduction Operations to Make the Array Elements Equal。因為是線性時間比起官方解答都要快，當然就100趴

[codes on Leetcode]https://leetcode.com/problems/reduction-operations-to-make-the-array-elements-equal/solutions/4303947/c-c-frequency-count-vs-sort-67-ms-beats-100/

[Leetcode playList]https://www.youtube.com/watch?v=odbN3KooN8s&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk