Buggy python submission (verdict: Runtime Error):
n = int(input())
v = [int(i) for i in input().split()]
m = n//2

a = [v[2*i] for i in range(0,m)]
b = [v[2*i+1] for i in range(0,m)]

def mode(arr):
        r = [0] * (max(arr) + 1)
        for a in arr:
            r[a] += 1
        return r.index(max(r))

A = mode(a)
B = mode(b)

if v.remove(A) == []:
    print(m)
    exit()
if A == B:
    if a.count(A) < b.count(B):
        C = mode(a.remove(A))
        print(n - a.count(C) - b.count(B))
    else:
        if b.count(B) == m:
            print(n)
        else:
            C = mode(b.remove(B))
            print(n - a.count(A) - b.count(C))
else:
    print(n - a.count(A) - b.count(B))

Fixed submission:
n = int(input())
v = [int(i) for i in input().split()]
m = n//2

a = [v[2*i] for i in range(0,m)]
b = [v[2*i+1] for i in range(0,m)]

def mode(arr):
        r = [0] * (max(arr) + 1)
        for a in arr:
            r[a] += 1
        return r.index(max(r))

A = mode(a)
B = mode(b)

v.remove(A)

if v == []:
    print(m)
    exit()
if A == B:
    if a.count(A) < b.count(B):
        a.remove(A)
        C = mode(a)
        print(n - a.count(C) - b.count(B))
    else:
        if b.count(B) == m:
            print(n - m)
        else:
            if a.count(A) == b.count(B):
                t = a.count(A)
                a.remove(A)
                b.remove(B)
                D = mode(a)
                E = mode(b)
                if a.count(D) > b.count(E):
                    print(n - t - a.count(D))
                else:
                    print(n - t - b.count(E))
            else:
                b.remove(B)
                C = mode(b)
                print(n - a.count(A) - b.count(C))
else:
    print(n - a.count(A) - b.count(B))

Buggy python submission (verdict: Runtime Error):
n = int(input())
v = [int(i) for i in input().split()]
m = n//2

a = [v[2*i] for i in range(0,m)]
b = [v[2*i+1] for i in range(0,m)]

def mode(arr):
        r = [0] * (max(arr) + 1)
        for a in arr:
            r[a] += 1
        return r.index(max(r))

A = mode(a)
B = mode(b)

if v.remove(A) == []:
    print(m)
    exit()
if A == B:
    if a.count(A) < b.count(B):
        C = mode(a.remove(A))
        print(n - a.count(C) - b.count(B))
    else:
        if b.count(B) == m:
            print(n-m)
        else:
            C = mode(b.remove(B))
            print(n - a.count(A) - b.count(C))
else:
    print(n - a.count(A) - b.count(B))

Fixed submission:
n = int(input())
v = [int(i) for i in input().split()]
m = n//2

a = [v[2*i] for i in range(0,m)]
b = [v[2*i+1] for i in range(0,m)]

def mode(arr):
        r = [0] * (max(arr) + 1)
        for a in arr:
            r[a] += 1
        return r.index(max(r))

A = mode(a)
B = mode(b)

v.remove(A)

if v == []:
    print(m)
    exit()
if A == B:
    if a.count(A) < b.count(B):
        a.remove(A)
        C = mode(a)
        print(n - a.count(C) - b.count(B))
    else:
        if b.count(B) == m:
            print(n - m)
        else:
            if a.count(A) == b.count(B):
                t = a.count(A)
                a.remove(A)
                b.remove(B)
                D = mode(a)
                E = mode(b)
                if a.count(D) > b.count(E):
                    print(n - t - a.count(D))
                else:
                    print(n - t - b.count(E))
            else:
                b.remove(B)
                C = mode(b)
                print(n - a.count(A) - b.count(C))
else:
    print(n - a.count(A) - b.count(B))