Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())

ARR = [int(s) for s in input().split(" ")]

import math
import numpy as np

def calculate(n,arr):
    srr = np.array([arr - index - 1 for index,arr in enumerate(arr)])

    maxValue = max(srr)
    minValue = min(srr)

    if maxValue * minValue < 0:
        if math.fabs(maxValue) > math.fabs(minValue):
            pinyizuidaxiang =  int(math.fabs(maxValue))
        else:
            pinyizuidaxiang = int(math.fabs(minValue))
    elif maxValue * minValue > 0:
        pinyizuidaxiang = int(math.fabs(maxValue))
    else:
        if math.fabs(maxValue) != 0:
            pinyizuidaxiang = int(math.fabs(maxValue))
        if math.fabs(minValue) != 0:
            pinyizuidaxiang = int(math.fabs(minValue))
        if (math.fabs(maxValue) == 0)  and (math.fabs(minValue) == 0):
            pinyizuidaxiang = 0


    minest = []

    if pinyizuidaxiang == 0:
        return sum(srr)

    for i in range(-pinyizuidaxiang,pinyizuidaxiang):
        minest.append(sum(np.fabs(srr - i)))

    return int(min(minest))

result = calculate(N,ARR)
print(result)


Fixed submission:

N = int(input())

ARR = [int(s) for s in input().split(" ")]

import numpy as np
def calculate(n,arr):
    srr = np.array([arr - index - 1 for index,arr in enumerate(arr)])

    srr = sorted(srr)

    if len(srr) % 2 == 0:
        centerIndex = len(srr)//2
        b = (srr[centerIndex] + srr[centerIndex-1])//2
    else:
        centerIndex = (len(srr) -1) //2
        b = srr[centerIndex]



    return sum(np.fabs(srr - b))

result = int(calculate(N,ARR))

print(result)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())

ARR = [int(s) for s in input().split(" ")]

import math

def calculate(n,arr):
    srr = [arr - index - 1 for index,arr in enumerate(arr)]

    maxValue = max(srr)
    minValue = min(srr)

    if maxValue * minValue < 0:
        if math.fabs(maxValue) > math.fabs(minValue):
            pinyizuidaxiang =  int(math.fabs(maxValue))
        else:
            pinyizuidaxiang = int(math.fabs(minValue))
    elif maxValue * minValue > 0:
        pinyizuidaxiang = int(math.fabs(maxValue))
    else:
        if math.fabs(maxValue) != 0:
            pinyizuidaxiang = int(math.fabs(maxValue))
        if math.fabs(minValue) != 0:
            pinyizuidaxiang = int(math.fabs(minValue))
        if (math.fabs(maxValue) == 0)  and (math.fabs(minValue) == 0):
            pinyizuidaxiang = 0


    minest = []

    if pinyizuidaxiang == 0:
        return sum(srr)

    for i in range(-pinyizuidaxiang,pinyizuidaxiang):
        minest.append(sum([math.fabs(sr -i) for sr in srr]))

    return int(min(minest))

result = calculate(N,ARR)
print(result)



Fixed submission:

N = int(input())

ARR = [int(s) for s in input().split(" ")]

import numpy as np
def calculate(n,arr):
    srr = np.array([arr - index - 1 for index,arr in enumerate(arr)])

    srr = sorted(srr)

    if len(srr) % 2 == 0:
        centerIndex = len(srr)//2
        b = (srr[centerIndex] + srr[centerIndex-1])//2
    else:
        centerIndex = (len(srr) -1) //2
        b = srr[centerIndex]



    return sum(np.fabs(srr - b))

result = int(calculate(N,ARR))

print(result)