1619.MeanofArrayAfterRemovingSomeElements.py

"""
    Given an integer array arr, return the mean of the remaining integers after 
    removing the smallest 5% and the largest 5% of the elements.

    Answers within 10-5 of the actual answer will be considered accepted.

    Example:
    Input: arr = [1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3]
    Output: 2.00000
    Explanation: After erasing the minimum and the maximum values of this array,
                 all elements are equal to 2, so the mean is 2.

    Example:
    Input: arr = [6,2,7,5,1,2,0,3,10,2,5,0,5,5,0,8,7,6,8,0]
    Output: 4.00000

    Example:
    Input: arr = [6,0,7,0,7,5,7,8,3,4,0,7,8,1,6,8,1,1,2,4,8,1,9,5,4,3,8,5,10,8,
                  6,6,1,0,6,10,8,2,3,4]
    Output: 4.77778

    Example:
    Input: arr = [9,7,8,7,7,8,4,4,6,8,8,7,6,8,8,9,2,6,0,0,1,10,8,6,3,3,5,1,10,
                  9,0,7,10,0,10,4,1,10,6,9,3,6,0,0,2,7,0,6,7,2,9,7,7,3,0,1,6,1,
                  10,3]
    Output: 5.27778

    Example:
    Input: arr = [4,8,4,10,0,7,1,3,7,8,8,3,4,1,6,2,1,1,8,0,9,8,0,3,9,10,3,10,1,
                  10,7,3,2,1,4,9,10,7,6,4,0,8,5,1,2,1,6,2,5,0,7,10,9,10,3,7,10,
                  5,8,5,7,6,7,6,10,9,5,10,5,5,7,2,10,7,7,8,2,0,1,1]
    Output: 5.29167

    Constraints:
        - 20 <= arr.length <= 1000
        - arr.length is a multiple of 20.
        - 0 <= arr[i] <= 105
"""
#Difficulty: Easy
#50 / 50 test cases passed.
#Runtime: 52 ms
#Memory Usage: 14.2 MB

#Runtime: 52 ms, faster than 94.18% of Python3 online submissions for Mean of Array After Removing Some Elements.
#Memory Usage: 14.2 MB, less than 100.00% of Python3 online submissions for Mean of Array After Removing Some Elements.

class Solution:
    def trimMean(self, arr: List[int]) -> float:
        arr.sort()
        length = len(arr)
        five = int(length * 0.05)
        return sum(arr[five:-five]) / (length - five * 2)