Buggy python submission (verdict: Runtime Error):
from collections import Counter

n = int(input())
V = [int(n) for n in input().split()]

if len(set(V)) == 1:
    ans = len(V) // 2
else:
    vp_ = [v for i, v in enumerate(V) if i%2 == 0] 
    vn_ = [v for i, v in enumerate(V) if i%2 != 0] 

    vp = Counter(vp_).most_common()
    vn = Counter(vn_).most_common()

    if vp[0][0] != vn[0][0]:
        gp = vp[0][1]
        gn = vn[0][1]
    else:
        if vp[0][1] > vn[0][1]:
            gp = vp[0][1]
            gn = vn[1][1]
        elif vp[0][1] < vn[0][1]:
            gp = vp[1][1]
            gn = vn[0][1]
        else vp[0][1] == vn[0][1]:
            if vp[1][1] >= vn[1][1]:
                gp = vp[1][1]
                gn = vn[0][1]
            else:
                gp = vp[0][1]
                gn = vn[1][1]
 
    ans = n - gp - gn
print(ans)

Fixed submission:
from collections import Counter

n = int(input())
V = [int(n) for n in input().split()]

if len(set(V)) == 1:
    ans = len(V) // 2
else:
    vp_ = [v for i, v in enumerate(V) if i%2 == 0] 
    vn_ = [v for i, v in enumerate(V) if i%2 != 0] 

    vp = Counter(vp_).most_common()
    vn = Counter(vn_).most_common()

    if vp[0][0] != vn[0][0]:
        gp = vp[0][1]
        gn = vn[0][1]
    else:
        if vp[0][1] > vn[0][1]:
            gp = vp[0][1]
            gn = vn[1][1]
        elif vp[0][1] < vn[0][1]:
            gp = vp[1][1]
            gn = vn[0][1]
        else:
            if vp[1][1] >= vn[1][1]:
                gp = vp[1][1]
                gn = vn[0][1]
            else:
                gp = vp[0][1]
                gn = vn[1][1]
 
    ans = n - gp - gn
print(ans)

Buggy python submission (verdict: Runtime Error):
from collections import Counter

n = int(input())
V = [int(n) for n in input().split()]

if len(set(V)) == 1:
    ans = len(V) // 2
else:
    vp_ = [v for i, v in enumerate(V) if i%2 == 0] 
    vn_ = [v for i, v in enumerate(V) if i%2 != 0] 

    vp = Counter(vp_).most_common()
    vn = Counter(vn_).most_common()

    if vp[0][0] != vn[0][0]:
        gp = vp[0][1]
        gn = vn[0][1]
    else:
        if vp[0][1] > vn[0][1]:
            gp = vp[0][1]
            gn = vn[1][1]
        elif vp[0][1] < vn[0][1]:
            gp = vp[1][1]
            gn = vn[0][1]
        else vp[0][1] == vn[0][1]:
            if vp[1][1] >= vn[1][1]:
                gp = vp[1][1]
                gn = vp[0][1]
            else:
                gp = vp[0][1]
                gn = vp[1][1]
 
    ans = n - gp - gn
print(ans)

Fixed submission:
from collections import Counter

n = int(input())
V = [int(n) for n in input().split()]

if len(set(V)) == 1:
    ans = len(V) // 2
else:
    vp_ = [v for i, v in enumerate(V) if i%2 == 0] 
    vn_ = [v for i, v in enumerate(V) if i%2 != 0] 

    vp = Counter(vp_).most_common()
    vn = Counter(vn_).most_common()

    if vp[0][0] != vn[0][0]:
        gp = vp[0][1]
        gn = vn[0][1]
    else:
        if vp[0][1] > vn[0][1]:
            gp = vp[0][1]
            gn = vn[1][1]
        elif vp[0][1] < vn[0][1]:
            gp = vp[1][1]
            gn = vn[0][1]
        else:
            if vp[1][1] >= vn[1][1]:
                gp = vp[1][1]
                gn = vn[0][1]
            else:
                gp = vp[0][1]
                gn = vn[1][1]
 
    ans = n - gp - gn
print(ans)