qyliang/CodeNanoFix huggingface dataset:
Buggy code:
A, B, K = input().split()

A = int(A)
B = int(B)
K = int(K)

for i in range(K):
	if i % 2 == 0:
		B += A /2
		A /= 2
	else:
		A += B / 2
		B /= 2
print(A + " " + B)


Fixed code:
A, B, K = map(int, input().split())
for i in range(K):
    if i % 2 == 0:
        A //= 2
        B += A
    else:
        B //= 2
        A += B
print(A, B)
Buggy code:
A, B, K = map(int, input().split())
for i in range(K):
    if i%2!=0:
        if A%2!=0;
            A-=1
        B+=A//2
    else:
        if B%2!=0;
            B-=1
        A+=B//2
print(A, B)


Fixed code:
A, B, K = map(int, input().split())

for i in range(K):
    if i % 2 == 0:
        if A % 2 != 0:
            A -=1
        tmp = A // 2
        A -= tmp
        B += tmp

    else:
        if B % 2 != 0:
            B -=1
        tmp = B // 2
        B -= tmp
        A += tmp
print(A, B)
Buggy code:
A, B, K = map(int, input().split())
 
for i in range(K):
	if i % 2 == 0:
		B = B + A/2
		A = A/2
	else:
		A = A + B/2
        B = B/2 
print ('{} {}'.format(A,B))

Fixed code:
A, B, K = map(int, input().split())

for i in range(K):
    if i % 2 == 0:
        if A % 2 != 0:
            A -= 1
        A //= 2
        B += A
    else:
        if B % 2 != 0:
            B -= 1
        B //= 2
        A += B

print("{0} {1}".format(A, B))
Buggy code:
A, B, K = map(int,input().split())
for i in range(K):
  if K % 2 == 0:
    if A % 2 != 0:
      A -= 1
    A /= 2
    B += A
  else:
    if B % 2 != 0:
      B -= 1
    B /= 2
    A += B
print(int(A), int(B))

Fixed code:
A,B,K = map(int,input().split())
turn = 0
for i in range(K) :
    if turn == 0 :
        if A % 2 != 0 :
            A -= 1
        p = A // 2
        A -= p
        B += p
        turn = 1
    else :
        if B % 2 != 0 :
            B -= 1
        q = B // 2
        B -= q
        A += q
        turn = 0
print(A,B)
Buggy code:
a,b,k=map(int,input().split())
for i in range(k):
  if i%2:
    b//=2
    a+=b
  else:
    a//=2
    b+=a
print(a,b

Fixed code:
a, b, k = tuple(map(int, input().split()))
for i in range(k):
    if i % 2 == 0:
        b += a // 2
        a = a // 2
    else:
        a += b //2
        b = b // 2
print(a, b)
Buggy code:
a, b, k = [ int(v) for v in input().split() ]

for i in range(k):
  if i % 2 == 0:
  	a = a // 2
    b += a // 2
  else:
    a += b // 2
    b = b // 2
print(a,b)

Fixed code:
a, b, k = [int(v) for v in input().split()]

for i in range(k):
    if i % 2 == 0:
        b += a // 2
        a //= 2
    else:
        a += b // 2
        b //= 2

print(a, b)
Buggy code:
A, B, K = map(int, input().split())

for k in range(K):

    if A % 2 != 0:
        
        A -= 1

    B += A/2
    A -= A/2

    if B % 2!= 0:

        B -= 1

    A += B/2
    B -= B/2

print(round(A), round(B))

Fixed code:
A, B, K = map(int, input().split())

for k in range(K):
    if k % 2 == 0:
        if A % 2 == 1:
            A -= 1
        B += int(A / 2)
        A -= int(A / 2)
    if k % 2 == 1:
        if B % 2 == 1:
            B -= 1
        A += int(B / 2)
        B -= int(B / 2)

print(A, B)
Buggy code:
A,B,K = map(int,input().split())

for _ in range(K):
  A -= A%2
  B -= B%2
  A = (A+B)//2
  B = A
print(A,B)

Fixed code:
A,B,K=map(int,input().split())

for _ in range(K//2):
    A//=2
    B+=A
    B//=2
    A+=B
if K%2:
    A//=2
    B+=A
    
print(A,B)
Buggy code:
a, b, k = map(int, input().split())
for i in range(k):
    if i % 2 == 0:
        if a % 2 == 1:
            a -= 1
        b += a / 2
        a /= 2
        
    else:
        if b % 2 == 1:
            b -= 1
        a += b / 2
        b /= 2
print(f"{a} {b}")

Fixed code:
a,b,k = map(int,input().split())

for i in range(k):
  if(i%2 == 0):
    if(a%2==1):
      a -= 1
    s = int(a/2)
    a -= s
    b += s
  else:
    if(b%2==1):
      b -= 1
    s = int(b/2)
    b -= s
    a += s

print("{} {}".format(a,b))
Buggy code:
a,b,k = map(int,input().split())

for i in range(k):
    if i % 2 == 0:
        if a % 2 == 1:
            a -= 1
        
        b += a / 2
        a /= 2
    else:
        if b % 2 == 1:
            b -= 1

        a += b / 2
        b /= 2


print(a,b)

Fixed code:
a,b,k=map(int,input().split())
for i in range(k):
    if i%2==0:
        a = a//2
        b += a
    else:
        b = b//2
        a += b
print(a,b)
Buggy code:
N = int(input())

A = [int(input()) for _ in range(N)]
A.sort()
B = A[::-1]

l1 = []
l2 = []
for i in range((N + int(N % 2 == 0)) // 2):
    l1.append(A[i])
    l1.append(B[i])
    l2.append(B[i])
    l2.append(A[i])

a, b = 0, 0
for i in range(N - int(N % 2 == 1) - 1):
    a += abs(l1[i] - l1[i + 1])
    b += abs(l2[i] - l2[i + 1])

print(a)
print(b)
if N % 2 == 0:
    a -= abs(l1[-1] - l1[-2])
    b -= abs(l2[-1] - l2[-2])
    a += max(abs(l1[0] - l1[-1]), abs(l1[-2] - l1[-1]))
    b += max(abs(l2[0] - l2[-1]), abs(l2[-2] - l2[-1]))
else:
    a += max(abs(l1[0] - A[(N - 1) // 2]), abs(l1[-1] - A[(N - 1) // 2]))
    b += max(abs(l2[0] - A[(N - 1) // 2]), abs(l2[-1] - A[(N - 1) // 2]))
res = max(a, b)

# print(l1)
# print(l2)
print(res)


Fixed code:
N = int(input())

A = [int(input()) for _ in range(N)]
A.sort()
B = A[::-1]

l1 = []
l2 = []
for i in range((N + int(N % 2 == 0)) // 2):
    l1.append(A[i])
    l1.append(B[i])
    l2.append(B[i])
    l2.append(A[i])

a, b = 0, 0
for i in range(N - int(N % 2 == 1) - 1):
    a += abs(l1[i] - l1[i + 1])
    b += abs(l2[i] - l2[i + 1])

# print(a)
# print(b)
if N % 2 == 0:
    a -= abs(l1[-1] - l1[-2])
    b -= abs(l2[-1] - l2[-2])
    a += max(abs(l1[0] - l1[-1]), abs(l1[-2] - l1[-1]))
    b += max(abs(l2[0] - l2[-1]), abs(l2[-2] - l2[-1]))
else:
    a += max(abs(l1[0] - A[(N - 1) // 2]), abs(l1[-1] - A[(N - 1) // 2]))
    b += max(abs(l2[0] - A[(N - 1) // 2]), abs(l2[-1] - A[(N - 1) // 2]))
res = max(a, b)

# print(l1)
# print(l2)
print(res)
Buggy code:
N = int(input())
A = sorted([int(input()) for _ in range(N)])
if N%2==0:
    B = A[:N//2]
    C = A[N//2:]
    C = C[::-1]
    D1 = []
    D2 = []
    for i in range(N//2):
        D1.append(B[i])
        D1.append(C[i])
        D2.append(C[i])
        D2.append(B[i])
    cnt1 = 0
    cnt2 = 0
    for i in range(1,N):
        cnt1 += abs(D1[i]-D1[i-1])
        cnt2 += abs(D2[i]-D2[i-1])
    print(max(cnt1,cnt2))
else:
    B = A[:N//2]
    C = A[N//2+1:]
    C = C[::-1]
    D1 = []
    D2 = []
    for i in range(N//2):
        D1.append(B[i])
        D1.append(C[i])
        D2.append(C[i])
        D2.append(B[i])
    cnt1 = 0
    cnt2 = 0
    for i in range(1,N-1):
        cnt1 += abs(D1[i]-D1[i-1])
        cnt2 += abs(D2[i]-D2[i-1])
    cnt1 += max(A[N//2]-D1[0],D1[-1]-A[N//2])
    cnt2 += max(D2[0]-A[N//2],A[N//2]-D2[-1])
    print(max(cnt1,cnt2))

Fixed code:
N = int(input())
A = sorted([int(input()) for _ in range(N)])
if N%2==0:
    B = A[:N//2]
    C = A[N//2:]
    C = C[::-1]
    D1 = []
    D2 = []
    for i in range(N//2-1):
        D1.append(B[i])
        D1.append(C[i])
        D2.append(C[i])
        D2.append(B[i])
    D1.append(B[-1])
    D1.insert(0,C[-1])
    D2.append(C[-1])
    D2.insert(0,B[-1])
    cnt1 = 0
    cnt2 = 0
    for i in range(1,N):
        cnt1 += abs(D1[i]-D1[i-1])
        cnt2 += abs(D2[i]-D2[i-1])
    print(max(cnt1,cnt2))
else:
    B = A[:N//2]
    C = A[N//2+1:]
    C = C[::-1]
    D1 = []
    D2 = []
    for i in range(N//2):
        D1.append(B[i])
        D1.append(C[i])
        D2.append(C[i])
        D2.append(B[i])
    cnt1 = 0
    cnt2 = 0
    for i in range(1,N-1):
        cnt1 += abs(D1[i]-D1[i-1])
        cnt2 += abs(D2[i]-D2[i-1])
    cnt1 += max(A[N//2]-D1[0],D1[-1]-A[N//2])
    cnt2 += max(D2[0]-A[N//2],A[N//2]-D2[-1])
    print(max(cnt1,cnt2))
Buggy code:
A.sort()
n = N//2
if N%2 != 0:
    ans1,ans2,ans = 0,0,0
    ar1,ar2 = A[:n],A[n+1:]
    ar = []
    for i in range(n):
        ar.append(ar2[i])
        ar.append(ar1[i])
    ar.append(A[n])
    for i in range(N-1):
        ans1 += abs(ar[i]-ar[i+1])
    ar = [A[n]]+ar[:-1]
    for i in range(N-1):
        ans2 += abs(ar[i]-ar[i+1])
    ans = max(ans1,ans2)
else:
    ans = 0
    ar1,ar2 = A[:n],A[n:]
    ar = []
    for i in range(n):
        ar.append(ar2[i])
        ar.append(ar1[i])
    for i in range(N-1):
        ans += abs(ar[i]-ar[i+1])
 
print(ans)

Fixed code:
N = int(input())
A = [int(input()) for _ in range(N)]

A.sort()
n = N//2
if N%2 != 0:
    ans1,ans2,ans = 0,0,0
    ar1,ar2 = A[:n],A[n+1:]
    ar = []
    for i in range(n):
        ar.append(ar2[i])
        ar.append(ar1[i])
    ar.append(A[n])
    for i in range(N-1):
        ans1 += abs(ar[i]-ar[i+1])
    ar = [A[n]]+ar[:-1]
    for i in range(N-1):
        ans2 += abs(ar[i]-ar[i+1])
    ans = max(ans1,ans2)
else:
    ans = 0
    ar1,ar2 = A[:n],A[n:]
    ar = []
    for i in range(n):
        ar.append(ar2[i])
        ar.append(ar1[i])
    for i in range(N-1):
        ans += abs(ar[i]-ar[i+1])
 
print(ans)
Buggy code:
N = int(input())
A = [int(input()) for _ in range(N)]

A.sort()

l = 0
r = N-1
p = []
ans = 0
while l < r:
    p.append(A[r])
    p.append(A[l])
    r -= 1
    l += 1
if N % 2 == 1:
    p.append(A[r])

p.append(p[0])
q = []
for i in range(len(p)-1):
    q.append(abs(p[i] - p[i+1]))

ans = sum(q)-min(q)

l = 0
r = N-1
p = []
ans = 0
while l < r:
    p.append(A[l])
    p.append(A[r])
    r -= 1
    l += 1
if N % 2 == 1:
    p.append(A[r])

p.append(p[0])
q = []
for i in range(len(p)-1):
    q.append(abs(p[i] - p[i+1]))

print(max(ans,sum(q)-min(q)))

Fixed code:
N = int(input())
A = [int(input()) for _ in range(N)]

A.sort()

l = 0
r = N-1
p = []
ans = 0
while l < r:
    p.append(A[r])
    p.append(A[l])
    r -= 1
    l += 1
if N % 2 == 1:
    p.append(A[r])

p.append(p[0])
q = []
for i in range(len(p)-1):
    q.append(abs(p[i] - p[i+1]))

ans = sum(q)-min(q)

l = 0
r = N-1
p = []
while l < r:
    p.append(A[l])
    p.append(A[r])
    r -= 1
    l += 1
if N % 2 == 1:
    p.append(A[r])

p.append(p[0])
q = []
for i in range(len(p)-1):
    q.append(abs(p[i] - p[i+1]))

print(max(ans,sum(q)-min(q)))
Buggy code:
from collections import deque
import copy
sys.setrecursionlimit(50000)
N = int(input())
d_1, d_2 = deque([]), deque([])
l = []
for i in range(N):
  l.append(int(input()))
  
l.sort()
l_1, l_2 = copy.copy(l), copy.copy(l)
d_1.append(max(l))
d_2.append(min(l))
l_1.pop()
l_2.pop(0)

def main1(d, l):
  d.appendleft(l[0])
  l.pop(0)
  if l == []:
    return d
  d.append(l[0])
  l.pop(0)
  if l == []:
    return d
  d.appendleft(l[-1])
  l.pop()
  if l == []:
    return d
  d.append(l[-1])
  l.pop()
  if l == []:
    return d
  else:
    return main1(d, l)
  
def main2(d, l):
  d.appendleft(l[-1])
  l.pop()
  if l == []:
    return d
  d.append(l[-1])
  l.pop()
  if l == []:
    return d
  d.appendleft(l[0])
  l.pop(0)
  if l == []:
    return d
  d.append(l[0])
  l.pop(0)
  if l == []:
    return d
  else:
    return main2(d, l)
  
x, y = 0, 0
a = main1(d_1, l_1)
b = main2(d_2, l_2)
for i in range(N-1):
  x += abs(a[i+1]-a[i])
  y += abs(b[i+1]-b[i])
print(max(x, y))

Fixed code:
from collections import deque
import copy
import sys
sys.setrecursionlimit(50000)
N = int(input())
d_1, d_2 = deque([]), deque([])
l = []
for i in range(N):
  l.append(int(input()))
  
l.sort()
l_1, l_2 = copy.copy(l), copy.copy(l)
d_1.append(max(l))
d_2.append(min(l))
l_1.pop()
l_2.pop(0)

def main1(d, l):
  d.appendleft(l[0])
  l.pop(0)
  if l == []:
    return d
  d.append(l[0])
  l.pop(0)
  if l == []:
    return d
  d.appendleft(l[-1])
  l.pop()
  if l == []:
    return d
  d.append(l[-1])
  l.pop()
  if l == []:
    return d
  else:
    return main1(d, l)
  
def main2(d, l):
  d.appendleft(l[-1])
  l.pop()
  if l == []:
    return d
  d.append(l[-1])
  l.pop()
  if l == []:
    return d
  d.appendleft(l[0])
  l.pop(0)
  if l == []:
    return d
  d.append(l[0])
  l.pop(0)
  if l == []:
    return d
  else:
    return main2(d, l)
  
x, y = 0, 0
a = main1(d_1, l_1)
b = main2(d_2, l_2)
for i in range(N-1):
  x += abs(a[i+1]-a[i])
  y += abs(b[i+1]-b[i])
print(max(x, y))
Buggy code:
N = int(input())
A = []
for _ in range(N):
    A.append(int(input()))

from collections import deque
from typing import Deque

A.sort()

DL = Deque(A)
DS = Deque(A)

LL = [0 for _ in range(N)]
LS = [0 for _ in range(N)]


if N % 2 == 0:

    for i in range(1, N, 2):
        LS[i] = DS.popleft()
        LL[i] = DL.pop()
    for j in range(0, N, 2):
        LS[j] = DS.popleft()
        LL[i] = DL.pop()

else:
    for i in range(1, N):
        if i % 2 == 1:
            LS[i] = DS.pop()
            LL[i] = DL.popleft()
        else:
            LS[i] = DS.popleft()
            LL[i] = DL.pop()

    LS[0] = DS.pop()
    LL[0] = DL.pop()

ansS = 0
ansL = 0
for i in range(1, N, 2):
    if i == N - 1:
        ansS += abs(LS[i] - LS[i-1])
        ansL += abs(LL[i] - LL[i-1])
    else:
        ansS += abs(LS[i] - LS[i-1])
        ansS += abs(LS[i] - LS[i+1])

        ansL += abs(LL[i] - LL[i-1])
        ansL += abs(LL[i] - LL[i+1])

print(max(ansS, ansL))


Fixed code:
N = int(input())
A = []
for _ in range(N):
    A.append(int(input()))

from collections import deque
from typing import Deque

A.sort()

DL = Deque(A)
DS = Deque(A)

LL = [0 for _ in range(N)]
LS = [0 for _ in range(N)]


if N % 2 == 0:

    for i in range(1, N, 2):
        LS[i] = DS.popleft()
        LL[i] = DL.pop()
    for j in range(0, N, 2):
        LS[j] = DS.popleft()
        LL[j] = DL.pop()

else:
    for i in range(1, N):
        if i % 2 == 1:
            LS[i] = DS.pop()
            LL[i] = DL.popleft()
        else:
            LS[i] = DS.popleft()
            LL[i] = DL.pop()

    LS[0] = DS.pop()
    LL[0] = DL.pop()

ansS = 0
ansL = 0
for i in range(1, N, 2):
    if i == N - 1:
        ansS += abs(LS[i] - LS[i-1])
        ansL += abs(LL[i] - LL[i-1])
    else:
        ansS += abs(LS[i] - LS[i-1])
        ansS += abs(LS[i] - LS[i+1])

        ansL += abs(LL[i] - LL[i-1])
        ansL += abs(LL[i] - LL[i+1])

print(max(ansS, ansL))
Buggy code:
from collections import deque
n=int(input())
a=deque(sorted([int(input()) for _ in range(n)]))
b=deque([a.pop()])
i=0
while a:
  if max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[-1]-b[-1]):
    b.append(a.pop())
  elif max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[-1]-b[0]):
    b.appendleft(a.pop())
  elif max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[0]-b[0]):
    b.appendleft(a.popleft())
  else:
    b.append(a.popleft())
ans=0
for i in range(n-1):
  ans+=abs(b[i]-b[i+1])
print(ans)
print(b)

Fixed code:
from collections import deque
n=int(input())
a=deque(sorted([int(input()) for _ in range(n)]))
b=deque([a.pop()])
i=0
while a:
  if max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[-1]-b[-1]):
    b.append(a.pop())
  elif max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[-1]-b[0]):
    b.appendleft(a.pop())
  elif max(abs(a[-1]-b[-1]),abs(a[-1]-b[0]),abs(a[0]-b[-1]),abs(a[0]-b[0]))==abs(a[0]-b[0]):
    b.appendleft(a.popleft())
  else:
    b.append(a.popleft())
ans=0
for i in range(n-1):
  ans+=abs(b[i]-b[i+1])
print(ans)
Buggy code:

        
def main():
    import sys

    def input(): return sys.stdin.readline().rstrip()

    n = int(input())
    a = [int(input()) for _ in range(n)]
    a.sort(reverse=True)
    if n%2 == 0:
        ans = 2*(sum(a[:n//2])-sum(a[n//2:]))
        ans += a[n//2]-a[n//2-1]
    else:
        ans = 2*(sum(a[:n//2])-sum(a[n//2+1:]))
        tmp = min(a[n//2]-a[n//2-1], a[n//2+1]-a[n//2])
        ans += tmp
    print(ans)



                
if __name__ == '__main__':
    main()

Fixed code:

        
def main():
    import sys

    def input(): return sys.stdin.readline().rstrip()

    n = int(input())
    a = [int(input()) for _ in range(n)]
    a.sort(reverse=True)
    if n%2 == 0:
        ans = 2*(sum(a[:n//2])-sum(a[n//2:]))
        ans += a[n//2]-a[n//2-1]
    else:
        ans = 2*(sum(a[:n//2])-sum(a[n//2+1:]))
        tmp = max(a[n//2]-a[n//2-1], a[n//2+1]-a[n//2])
        ans += tmp
    print(ans)



                
if __name__ == '__main__':
    main()
Buggy code:
import sys
from collections import deque

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline

in_n = lambda: int(readline())
in_nn = lambda: map(int, readline().split())
in_nl = lambda: list(map(int, readline().split()))
in_na = lambda: map(int, read().split())
in_s = lambda: readline().rstrip().decode('utf-8')


def main():
    N = in_n()
    A = deque(sorted(list(in_na())))

    al = deque([A.popleft()])

    f = True
    while A:
        if len(A) >= 2:
            if f:
                al.append(A.pop())
                al.appendleft(A.pop())
                f = False
            else:
                al.appendleft(A.popleft())
                al.append(A.popleft())
                f = True

        elif len(A) == 1:
            al.append(A.pop())

    ans = 0
    for i in range(N - 1):
        ans += abs(al[i + 1] - al[i])

    print(ans)


if __name__ == '__main__':
    main()


Fixed code:
import sys
from collections import deque
import copy

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline

in_n = lambda: int(readline())
in_nn = lambda: map(int, readline().split())
in_nl = lambda: list(map(int, readline().split()))
in_na = lambda: map(int, read().split())
in_s = lambda: readline().rstrip().decode('utf-8')


def calc(N, A, max_min):

    if max_min:
        al = deque([A.popleft()])
        f = True
    else:
        al = deque([A.pop()])
        f = False

    while A:
        if len(A) >= 2:
            if f:
                al.append(A.pop())
                al.appendleft(A.pop())
                f = False
            else:
                al.appendleft(A.popleft())
                al.append(A.popleft())
                f = True

        elif len(A) == 1:
            al.append(A.pop())

    ans = 0
    for i in range(N - 1):
        ans += abs(al[i + 1] - al[i])

    return ans


def main():
    N = in_n()
    A = deque(sorted(list(in_na())))

    ans1 = calc(N, copy.copy(A), True)
    ans2 = calc(N, copy.copy(A), False)
    print(max(ans1, ans2))


if __name__ == '__main__':
    main()
Buggy code:
from copy import deepcopy

n,*a = map(int,open(0).read().split())
acopy = deepcopy(a)
a.sort()
acopy.sort(reverse = True)

L = deque([])
a = deque(a)
acopy = deque(acopy)
Lcopy = deepcopy(L)

max_ = a.pop()
L.append(max_)
min_ = acopy.pop()
Lcopy.append(min_)

while a:
    if a:
        b = a.popleft()
        L.append(b)
    if a:
        c = a.popleft()
        L.appendleft(c)
    if a:
        d = a.pop()
        L.append(d)
    if a:
        e = a.pop()
        L.appendleft(e)

while acopy:
    if acopy:
        b = acopy.popleft()
        Lcopy.append(b)
    if acopy:
        c = acopy.popleft()
        Lcopy.appendleft(c)
    if acopy:
        d = acopy.pop()
        Lcopy.append(d)
    if acopy:
        e = acopy.pop()
        Lcopy.appendleft(e)
ans1,ans2 = 0,0
#print(L,Lcopy)
for i in range(len(L)-1):
    ans1 +=abs(L[i+1] - L[i])
for i in range(len(Lcopy)-1):
    ans2 +=abs(Lcopy[i+1] - Lcopy[i])
print(max(ans1,ans2))

Fixed code:
from collections import deque
from copy import deepcopy

n,*a = map(int,open(0).read().split())
acopy = deepcopy(a)
a.sort()
acopy.sort(reverse = True)

L = deque([])
a = deque(a)
acopy = deque(acopy)
Lcopy = deepcopy(L)

max_ = a.pop()
L.append(max_)
min_ = acopy.pop()
Lcopy.append(min_)

while a:
    if a:
        b = a.popleft()
        L.append(b)
    if a:
        c = a.popleft()
        L.appendleft(c)
    if a:
        d = a.pop()
        L.append(d)
    if a:
        e = a.pop()
        L.appendleft(e)

while acopy:
    if acopy:
        b = acopy.popleft()
        Lcopy.append(b)
    if acopy:
        c = acopy.popleft()
        Lcopy.appendleft(c)
    if acopy:
        d = acopy.pop()
        Lcopy.append(d)
    if acopy:
        e = acopy.pop()
        Lcopy.appendleft(e)
ans1,ans2 = 0,0
#print(L,Lcopy)
for i in range(len(L)-1):
    ans1 +=abs(L[i+1] - L[i])
for i in range(len(Lcopy)-1):
    ans2 +=abs(Lcopy[i+1] - Lcopy[i])
print(max(ans1,ans2))
Buggy code:
import sys
import math
import itertools
import bisect
from copy import copy
from collections import deque,Counter
from decimal import Decimal
def s(): return input()
def i(): return int(input())
def S(): return input().split()
def I(): return map(int,input().split())
def X(): return list(input())
def L(): return list(input().split())
def l(): return list(map(int,input().split()))
def lcm(a,b): return a*b//math.gcd(a,b)
def gcd(*numbers): reduce(math.gcd, numbers)
sys.setrecursionlimit(10 ** 9)
mod = 10**9+7
count = 0
ans = 0

N = i()
A = []
for j in range(N):
    a = i()
    A.append(a)

A.sort()
b = N // 2 -1
if N % 2 == 0:
    for i in range(b):
        ans += 2*A[N-1-i]-2*A[i]

    ans += A[b+1]-A[b]
else:
    for i in range(b):
        ans += 2*A[N-1-i]-2*A[i]

    ans += 2*A[N-1-b]-A[b+1]-A[b]




print(ans)


Fixed code:
import sys
import math
import itertools
import bisect
from copy import copy
from collections import deque,Counter
from decimal import Decimal
def s(): return input()
def i(): return int(input())
def S(): return input().split()
def I(): return map(int,input().split())
def X(): return list(input())
def L(): return list(input().split())
def l(): return list(map(int,input().split()))
def lcm(a,b): return a*b//math.gcd(a,b)
def gcd(*numbers): reduce(math.gcd, numbers)
sys.setrecursionlimit(10 ** 9)
mod = 10**9+7
count = 0
ans = 0

N = i()
A = []
for j in range(N):
    a = i()
    A.append(a)

A.sort()
b = N // 2
if N % 2 == 0:
    ans = 2*sum(A[b:])-2*sum(A[:b])
    ans += A[b-1]-A[b]
else:
    ans = 2*sum(A[b+1:])-2*sum(A[:b])
    ans += max(A[b]-A[b+1],-A[b]+A[b-1])

print(ans)
Buggy code:
from collections import deque
N = int(input())
a = []
for i in range(N):
    a.append(int(input()))
a.sort()
d = deque(a)
ans = deque([d.popleft()])
cur = 0
while d:
    if cur%2 == 0:
        ans.appendleft(d.pop())
        if len(d) != 0:
            ans.append(d.pop())
    else:
        ans.appendleft(d.popleft())
        if len(d) != 0:
            ans.append(d.popleft())
p = 0
for x, y in zip(list(ans), list(ans)[1:]):
    p += abs(x-y)
print(p)

Fixed code:
from collections import deque
N = int(input())
a = []
for i in range(N):
    a.append(int(input()))
a.sort()
d = deque(a)
ans = deque([d.popleft()])
cur = 0
while d:
    if cur%2 == 0:
        ans.appendleft(d.pop())
        if len(d) != 0:
            ans.append(d.pop())
        cur += 1
    else:
        ans.appendleft(d.popleft())
        if len(d) != 0:
            ans.append(d.popleft())
        cur += 1
p = 0
for x, y in zip(list(ans), list(ans)[1:]):
    p += abs(x-y)

d = deque(a)
ans = deque([d.pop()])
cur = 1
while d:
    if cur%2 == 0:
        ans.appendleft(d.pop())
        if len(d) != 0:
            ans.append(d.pop())
        cur += 1
    else:
        ans.appendleft(d.popleft())
        if len(d) != 0:
            ans.append(d.popleft())
        cur += 1
q = 0
for x, y in zip(list(ans), list(ans)[1:]):
    q += abs(x-y)
print(max(p, q))
Buggy code:
n = int(input())
a = sorted([int(input()) for _ in range(n)])

if n % 2 == 0:
    ans1 = 2 * (sum(a[n // 2:]) - sum(a[:n // 2]))
    ans1 += a[n // 2] + a[n // 2 + 1]
    ans2 = 2 * (sum(a[n // 2 - 1:]) - sum(a[:n // 2 - 1]))
    ans2 += a[n // 2 - 1] + a[n // 2]
    print(max(ans1, ans2))
elif n % 2 == 1:
    ans = 2 * (sum(a[n // 2 + 1:]) - sum(a[:n // 2 + 1]))
    print(ans + a[n // 2] + a[n // 2 - 1])


Fixed code:
n = int(input())
a = sorted(int(input()) for _ in range(n))
m = n // 2
if n % 2 == 0:
    ans = (sum(a[m:]) - sum(a[:m])) * 2 - a[m] + a[m-1]
    print(ans)
else:
    ans1 = (sum(a[m+1:]) - sum(a[:m])) * 2 - a[m] + a[m-1]
    ans2 = (sum(a[m+1:]) - sum(a[:m])) * 2 - a[m+1] + a[m]
    print(max(ans1, ans2))