Buggy python submission (verdict: Runtime Error):
def main():
    n = int(input())
    v = [int(i) for i in input().split()]
    v_even = v[::2]
    v_odd = v[1::2]
    from collections import Counter
    v_even_cnt = sorted(list(Counter(v_even).items()),key=lambda x:x[1],reverse=True)
    v_odd_cnt = sorted(list(Counter(v_odd).items()),key=lambda x:x[1],reverse=True)
    ans = -1
    if v_even_cnt[0][0] != v_odd_cnt[0][0]:
        ans = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[0][1]
    else:
        print(v_even_cnt,v_odd_cnt)
        if v_even_cnt[0][1] < v_odd_cnt[0][1]:
            if len(v_even_cnt) > 1:
                ans = len(v_even) - v_even_cnt[1][1] + len(v_odd) - v_odd_cnt[0][1]
            else:
                ans = len(v_even) - 0 + len(v_odd) - v_odd_cnt[0][1]
        elif v_even_cnt[0][1] > v_odd_cnt[0][1]:
            if len(v_odd_cnt) > 1:
                ans = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[1][1]
            else:
                ans = len(v_even) - v_even_cnt[0][1] + len(v_odd) - 0
        else:
            if v_even_cnt[1][1] > v_odd_cnt[1][1]:
                ans = v_even_cnt[0][1] + v_odd_cnt[1][1]
            else:
                ans = v_even_cnt[1][1] + v_odd_cnt[0][1]
    print(ans)
if __name__ == '__main__':
    main()

Fixed submission:
def main():
    n = int(input())
    v = [int(i) for i in input().split()]
    v_even = v[::2]
    v_odd = v[1::2]
    from collections import Counter
    v_even_cnt = sorted(list(Counter(v_even).items()),key=lambda x:x[1],reverse=True)
    v_odd_cnt = sorted(list(Counter(v_odd).items()),key=lambda x:x[1],reverse=True)
    ans = 0
    if v_even_cnt[0][0] != v_odd_cnt[0][0]:
        ans = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[0][1]
    else:
        if len(v_even_cnt) == 1:
            ans = len(v_even)
        else:
            ans1 = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[1][1]
            ans2 = len(v_even) - v_even_cnt[1][1] + len(v_odd) - v_odd_cnt[0][1]
            ans = min(ans1,ans2)
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
v = [int(i) for i in input().split()]
v_even = v[::2]
v_odd = v[1::2]
e_max = 0
e_max_ele = 0
for e in set(v_even):
    tmp = v_even.count(e)
    if e_max < tmp:
        e_max = tmp
        e_max_ele = e
ans1 = len(v_even) - e_max

o_max = 0
o_max_ele = 0
for o in set(v_odd):
    tmp = v_odd.count(o)
    if o_max < tmp:
        o_max = tmp
        o_max_ele = o
ans2 = len(v_odd) - o_max

if e_max_ele == o_max_ele:
    if e_max < o_max:
        ban = e_max_ele
        e_max = 0
        e_max_ele = 0
        for e in set(v_even):
            if e == ban:
                continue
            tmp = v_even.count(e)
            if e_max < tmp:
                e_max = tmp
                e_max_ele = e
        ans1 = len(v_even) - e_max
    else:
        ban = o_max_ele
        o_max = 0
        o_max_ele = 0
        for o in set(v_odd):
            if o == ban:
                continue
            tmp = v_odd.count(o)
            if o_max < tmp:
                o_max = tmp
                o_max_ele = o
        ans2 = len(v_odd) - o_max

print(ans1+ans2)

Fixed submission:
def main():
    n = int(input())
    v = [int(i) for i in input().split()]
    v_even = v[::2]
    v_odd = v[1::2]
    from collections import Counter
    v_even_cnt = sorted(list(Counter(v_even).items()),key=lambda x:x[1],reverse=True)
    v_odd_cnt = sorted(list(Counter(v_odd).items()),key=lambda x:x[1],reverse=True)
    ans = 0
    if v_even_cnt[0][0] != v_odd_cnt[0][0]:
        ans = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[0][1]
    else:
        if len(v_even_cnt) == 1:
            ans = len(v_even)
        else:
            ans1 = len(v_even) - v_even_cnt[0][1] + len(v_odd) - v_odd_cnt[1][1]
            ans2 = len(v_even) - v_even_cnt[1][1] + len(v_odd) - v_odd_cnt[0][1]
            ans = min(ans1,ans2)
    print(ans)
if __name__ == '__main__':
    main()