Buggy python submission (verdict: Runtime Error):
from collections import Counter
n = int(input())
v = list(map(int, input().split()))
gu = v[::2]
ki = v[1::2]
ans = 0
k,g = False,False

###全部同じなら全長の半分,
# 最頻値が同じなら2番目を比べる
if v.count(v[0]) == n
    ans += n // 2
else:
    kic = Counter(ki)
    guc = Counter(gu)
    k1 = kic.most_common(2)
    g1 = guc.most_common(2)
    if k1[0][0] == g1[0][0]:
        if k1[1][1] < g1[1][1]:
            g = True
        else:
            k = True

    kic = list(kic.values())
    guc = list(guc.values())
    kic.sort(reverse = True)
    guc.sort(reverse = True)
    if len(kic) != 1:
        if k:
            ans += kic[0]
            ans += sum(kic[2::])
        else:
            ans += sum(kic[1::]) 
    if len(guc) != 1:
        if g:
            ans += guc[0]
            ans += sum(guc[2::])
        else:
            ans += sum(guc[1::])

print(ans)

Fixed submission:
from collections import Counter
n = int(input())
v = list(map(int, input().split()))
gu = v[::2]
ki = v[1::2]
ans = 0
k,g = False,False

if v.count(v[0]) == n:#全部同じ
    ans += n // 2
else:
    kic = Counter(ki)
    guc = Counter(gu)
    k1 = kic.most_common(2)
    g1 = guc.most_common(2)
    if k1[0][0] == g1[0][0]:
        if k1[1][1] < g1[1][1]:
            k = True
        else:
            g = True

    kic = list(kic.values())
    guc = list(guc.values())
    kic.sort(reverse = True)
    guc.sort(reverse = True)
    if len(kic) != 1:
        if g:
            ans += kic[0]
            ans += sum(kic[2::])
        else:
            ans += sum(kic[1::]) 
    if len(guc) != 1:
        if k:
            ans += guc[0]
            ans += sum(guc[2::])
        else:
            ans += sum(guc[1::])

print(ans)

Buggy python submission (verdict: Runtime Error):
from collections import Counter
n = int(input())
v = list(map(int, input().split()))
gu = [::2]
ki = [1::2]
ans = 0
k,g = False,False

if v.count(v[0]) == n:#全部同じ
    ans += n // 2
else:
    kic = Counter(ki)
    guc = Counter(gu)
    k1 = kic.most_common(2)
    g1 = guc.most_common(2)
    if k1[0][0] == g1[0][0]:
        if k1[1][1] < g1[1][1]:
            k = True
        elif k1[1][1] > g1[1][1]:
            g = True

    kic = list(kic.values())
    guc = list(guc.values())
    kic.sort(reverse = True)
    guc.sort(reverse = True)
    if len(kic) != 1:
        if k:
            ans += kic[0]
            ans += sum(kic[2::])
        else:
            ans += sum(kic[1::]) 
    if len(guc) != 1:
        if g:
            ans += guc[0]
            ans += sum(guc[2::])
        else:
            ans += sum(guc[1::])

print(ans)

Fixed submission:
from collections import Counter
n = int(input())
v = list(map(int, input().split()))
gu = v[::2]
ki = v[1::2]
ans = 0
k,g = False,False

if v.count(v[0]) == n:#全部同じ
    ans += n // 2
else:
    kic = Counter(ki)
    guc = Counter(gu)
    k1 = kic.most_common(2)
    g1 = guc.most_common(2)
    if k1[0][0] == g1[0][0]:
        if k1[1][1] < g1[1][1]:
            k = True
        else:
            g = True

    kic = list(kic.values())
    guc = list(guc.values())
    kic.sort(reverse = True)
    guc.sort(reverse = True)
    if len(kic) != 1:
        if g:
            ans += kic[0]
            ans += sum(kic[2::])
        else:
            ans += sum(kic[1::]) 
    if len(guc) != 1:
        if k:
            ans += guc[0]
            ans += sum(guc[2::])
        else:
            ans += sum(guc[1::])

print(ans)