Buggy python submission (verdict: Runtime Error):
import sys
import math
N = input()
AList = list(map(int, input().split()))
listnum = 1000000000

low = -1000000000
high = 1000000000

mode = 1
a1 = 0
a2 = 0
while(True):
    p1 = math.floor((abs(low) + abs(high))/3) + low
    p2 = high - math.floor((abs(low) + abs(high))/3) 

    for j in range(1,int(N)+1):
        a1 += abs(AList[j-1] -(p1 + j))
    for j in range(1,int(N)+1):
        a2 += abs(AList[j-1] -(p2 + j))

    if a1 == a2 or abs(a1-a2) == 1:
        print(min(a1,a2))
        sys.exit()
    elif a1 < a2:
        high = p2
    else:
        low = p1        
    a1 = 0
    a2 = 0

Fixed submission:
from statistics import median
N = int(input())
AList = list(map(int, input().split()))
 
L = []
m = 0
for j in range(1, N+1):
    L.append(AList[j-1] - j)
m = median(L)
 
p = 0
for j in range(1, N+1):
    p += abs(AList[j-1] - j - m)
 
print(int(p))

Buggy python submission (verdict: Time Limit Exceeded):
from statistics import median
N = int(input())
AList = list(map(int, input().split()))

L = []
m = 0
for j in range(1, N+1):
    L.append(AList[j-1] - j)
    m = median(L)

p = 0
for j in range(1, N+1):
    p += abs(AList[j-1] - j - m)

print(int(p))


Fixed submission:
from statistics import median
N = int(input())
AList = list(map(int, input().split()))
 
L = []
m = 0
for j in range(1, N+1):
    L.append(AList[j-1] - j)
m = median(L)
 
p = 0
for j in range(1, N+1):
    p += abs(AList[j-1] - j - m)
 
print(int(p))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import math
N = input()
AList = list(map(int, input().split()))
listnum = 1000000000

low = -1000000000
high = 1000000000

mode = 1
p = 0
a = 0
while(True):
    L = []
    center = math.floor((low + high)/2)
    for i in range(-1+center, 2+center):
        for j in range(1,int(N)+1):
            p += abs(AList[j-1] -(i + j))
        L.append(p)        
        p = 0

    if L[1] == min(L):
        print(L[1])
        sys.exit()
    elif L[0] == min(L):
        high = center - 1
    else:
        low = center + 1        

Fixed submission:
from statistics import median
N = int(input())
AList = list(map(int, input().split()))
 
L = []
m = 0
for j in range(1, N+1):
    L.append(AList[j-1] - j)
m = median(L)
 
p = 0
for j in range(1, N+1):
    p += abs(AList[j-1] - j - m)
 
print(int(p))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
N = input()
AList = list(map(int, input().split()))

mode = 1
L = []
p = 0
for i in range(-1, 2):
    for j in range(1,int(N)+1):
        p += abs(AList[j-1] -(i + j))
    L.append(p)        
    p = 0

if L[1] == min(L):
    print(L[1])
    sys.exit()
elif L[0] == min(L):
    pre = L[0]
    mode = -1
else:
    pre = L[2]
    mode = 1    
    
for i in range(2 * mode,1000000000 * mode ,mode):
    for j in range(1,int(N)+1):
        p += abs(AList[j-1] -(i + j))
    if pre < p:
        print(pre)
        sys.exit()
    else:
        pre = p
    p = 0

Fixed submission:
from statistics import median
N = int(input())
AList = list(map(int, input().split()))
 
L = []
m = 0
for j in range(1, N+1):
    L.append(AList[j-1] - j)
m = median(L)
 
p = 0
for j in range(1, N+1):
    p += abs(AList[j-1] - j - m)
 
print(int(p))