Buggy python submission (verdict: Runtime Error):
n=int(input())
v_list = list(map(int,input().split()))
odd_list = []
even_list = []

for i in range(n):
    if i % 2 == 0:
        odd_list.append(v_list[i]) 
    else:
        even_list.append(v_list[i])

import collections

odd_list_c = collections.Counter(odd_list)
even_list_c = collections.Counter(even_list)

if odd_list_c.most_common()[0][0] != even_list_c.most_common()[0][0]:
    ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[0][1]
else:
    if len(even_list_c) == 1 && len(odd_list_c) == 1:
        ans = n // 2
    else: 
        if odd_list_c.most_common()[0][1] >= even_list_c.most_common()[0][1]:
            ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[1][1]
        elif odd_list_c.most_common()[0][1] < even_list_c.most_common()[0][1]:
            ans = n - odd_list_c.most_common()[1][1] - even_list_c.most_common()[0][1]

print(ans)

Fixed submission:
n=int(input())
v_list = list(map(int,input().split()))
odd_list = []
even_list = []

for i in range(n):
    if i % 2 == 0:
        odd_list.append(v_list[i]) 
    else:
        even_list.append(v_list[i])

import collections

odd_list_c = collections.Counter(odd_list)
even_list_c = collections.Counter(even_list)

if odd_list_c.most_common()[0][0] != even_list_c.most_common()[0][0]:
    ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[0][1]
else:
    if len(even_list_c) == 1 and len(odd_list_c) == 1:
        ans = n // 2
    else: 
        ans1 = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[1][1]
        ans2 = n - odd_list_c.most_common()[1][1] - even_list_c.most_common()[0][1]
        ans = min(ans1, ans2)

print(ans)

Buggy python submission (verdict: Runtime Error):
n=int(input())
v_list = list(map(int,input().split()))
odd_list = []
even_list = []

for i in range(n):
    if i % 2 == 0:
        odd_list.append(v_list[i]) 
    else:
        even_list.append(v_list[i])

import collections

odd_list_c = collections.Counter(odd_list)
even_list_c = collections.Counter(even_list)

if odd_list_c.most_common()[0][0] != even_list_c.most_common()[0][0]:
    ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[0][1]
else:
    if odd_list_c.most_common()[0][1] >= even_list_c.most_common()[0][1]:
        ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[1][1]
    else:
        ans = n - odd_list_c.most_common()[1][1] - even_list_c.most_common()[0][1]

print(ans)

Fixed submission:
n=int(input())
v_list = list(map(int,input().split()))
odd_list = []
even_list = []

for i in range(n):
    if i % 2 == 0:
        odd_list.append(v_list[i]) 
    else:
        even_list.append(v_list[i])

import collections

odd_list_c = collections.Counter(odd_list)
even_list_c = collections.Counter(even_list)

if odd_list_c.most_common()[0][0] != even_list_c.most_common()[0][0]:
    ans = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[0][1]
else:
    if len(even_list_c) == 1 and len(odd_list_c) == 1:
        ans = n // 2
    else: 
        ans1 = n - odd_list_c.most_common()[0][1] - even_list_c.most_common()[1][1]
        ans2 = n - odd_list_c.most_common()[1][1] - even_list_c.most_common()[0][1]
        ans = min(ans1, ans2)

print(ans)