Buggy python submission (verdict: Runtime Error):
n = int(input())
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

lsacnt = sorted(acnt.items(), key=lambda x: x[1],reverse=True)
lsbcnt = sorted(bcnt.items(), key=lambda j: j[1],reverse=True)

def val(abcnt, ablscnt):
	if len(list(abcnt)) < 2:
		return 0
	else:
		return ablscnt[1][1]

if lsacnt[0][0] != lsbcnt[0][0]:
	ans = n - lsacnt[0][1] - lsbcnt[0][1]
elif lsacnt[0][0] == lsbcnt[0][0]:
	if lsacnt[0][1] > lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - val(bcnt,lsbcnt)
	elif lsacnt[0][1] < lsbcnt[0][1]:
		ans = n - val(acnt,lsacnt) - lsbcnt[0][1]
	elif lsacnt[0][1] == lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - max(lsacnt[1][1],lsbcnt[1][1])

print(ans)

Fixed submission:
n = int(input())
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

lsacnt = sorted(acnt.items(), key=lambda x: x[1],reverse=True)
lsbcnt = sorted(bcnt.items(), key=lambda j: j[1],reverse=True)

def val(abcnt, ablscnt):
	if len(list(abcnt)) < 2:
		return 0
	else:
		return ablscnt[1][1]

if lsacnt[0][0] != lsbcnt[0][0]:
	ans = n - lsacnt[0][1] - lsbcnt[0][1]
elif lsacnt[0][0] == lsbcnt[0][0]:
	if lsacnt[0][1] > lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - val(bcnt,lsbcnt)
	elif lsacnt[0][1] < lsbcnt[0][1]:
		ans = n - val(acnt,lsacnt) - lsbcnt[0][1]
	elif lsacnt[0][1] == lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - max(val(acnt,lsacnt),val(bcnt,lsbcnt))

print(ans)

Buggy python submission (verdict: Runtime Error):
n = int(input())
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

lsacnt = sorted(acnt.items(), key=lambda x: x[1])
lsbcnt = sorted(bcnt.items(), key=lambda y: y[1])

def val(abcnt, ablscnt):
	if len(list(abcnt)) < 2:
		return ablscnt[1][1]
	else:
		return 0

if lsacnt[0][0] != lsbcnt[0][0]:
	ans = n - lsacnt[0][1] - lsbcnt[0][1]
elif lsacnt[0][0] == lsbcnt[0][0]:
	if lsacnt[0][1] >= lsbcnt[0][1]:
		ans = n - lsacnt[0][0] - val(bcnt,lsbcnt)
	else:
		ans = n - val(acnt,lsbcnt) - lsbcnt[0][0]

print(ans)
	

	

Fixed submission:
n = int(input())
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

lsacnt = sorted(acnt.items(), key=lambda x: x[1],reverse=True)
lsbcnt = sorted(bcnt.items(), key=lambda j: j[1],reverse=True)

def val(abcnt, ablscnt):
	if len(list(abcnt)) < 2:
		return 0
	else:
		return ablscnt[1][1]

if lsacnt[0][0] != lsbcnt[0][0]:
	ans = n - lsacnt[0][1] - lsbcnt[0][1]
elif lsacnt[0][0] == lsbcnt[0][0]:
	if lsacnt[0][1] > lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - val(bcnt,lsbcnt)
	elif lsacnt[0][1] < lsbcnt[0][1]:
		ans = n - val(acnt,lsacnt) - lsbcnt[0][1]
	elif lsacnt[0][1] == lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - max(val(acnt,lsacnt),val(bcnt,lsbcnt))

print(ans)

Buggy python submission (verdict: Runtime Error):
n = input()
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

amaxval = acnt[list(acnt)[0]]
bmaxval = bcnt[list(bcnt)[0]]

amaxkey = list(acnt)[0]
bmaxkey = list(bcnt)[0]

def val(ab, abcnt):
	if len(ab) < 2:
		return 0
	else:
		return abcnt[list(abcnt)[0]]

if amaxkey != bmaxkey:
	ans = n - amaxval - bmaxval
else:
	if amaxval >= bmaxval:
		ans = n - amaxval - val(b,bcnt)
	else:
		ans = n - val(a,acnt) - bmaxval

print(ans)
	

	

Fixed submission:
n = int(input())
arr = list(map(int, input().split()))

a = [arr[i] for i in range(0,n,2)]
b = [arr[y] for y in range(1,n,2)]

import collections
acnt = collections.Counter(a)
bcnt = collections.Counter(b)

lsacnt = sorted(acnt.items(), key=lambda x: x[1],reverse=True)
lsbcnt = sorted(bcnt.items(), key=lambda j: j[1],reverse=True)

def val(abcnt, ablscnt):
	if len(list(abcnt)) < 2:
		return 0
	else:
		return ablscnt[1][1]

if lsacnt[0][0] != lsbcnt[0][0]:
	ans = n - lsacnt[0][1] - lsbcnt[0][1]
elif lsacnt[0][0] == lsbcnt[0][0]:
	if lsacnt[0][1] > lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - val(bcnt,lsbcnt)
	elif lsacnt[0][1] < lsbcnt[0][1]:
		ans = n - val(acnt,lsacnt) - lsbcnt[0][1]
	elif lsacnt[0][1] == lsbcnt[0][1]:
		ans = n - lsacnt[0][1] - max(val(acnt,lsacnt),val(bcnt,lsbcnt))

print(ans)