Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
#print(arr)
a=0
most_e=0
most_o=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
#print(arr_e,arr_o)
arr_es=set(arr_e)
arr_os=set(arr_o)
#print(arr_es,arr_os)

for i in arr_es:
    cnt_e=arr_e.count(i)
    if cnt_e>most_e:
        most_e=cnt_e
        if most_e>=(n/2-most_e)/2:
            break
for i in arr_os:    
    cnt_o=arr_o.count(i)
    if cnt_o>most_o:
        most_o=cnt_o
        if most_o>=(n/2-most_o)/2:
            break
#print(most_e,most_o)
if len(arr_s)==1:
    print(int(n/2))
else:
    print(n-most_e-most_o)

Fixed submission:
import collections
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
a=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
ce=collections.Counter(arr_e).most_common()
co=collections.Counter(arr_o).most_common()
if len(arr_s)==1:
    print(int(n/2))
else:
    if ce[0][0]!=co[0][0]:
        print(n-ce[0][1]-co[0][1])
    else:
        print(n-max(ce[0][1]+co[1][1],ce[1][1]+co[0][1]))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
#print(arr)
a=0
most_e=0
most_o=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
#print(arr_e,arr_o)
arr_es=set(arr_e)
arr_os=set(arr_o)
#print(arr_es,arr_os)

for i in arr_es:
    cnt_e=arr_e.count(i)
    if cnt_e>most_e:
        most_e=cnt_e
        if cnt_e>=(n/2-cnt_e)/2:
            break
        
for i in arr_os:
    cnt_o=arr_o.count(i)
    if cnt_o>most_o:
        most_o=cnt_o
        if cnt_o>=(n/2-cnt_o)/2:
            break

#print(most_e,most_o)
if len(arr_s)==1:
    print(int(n/2))
else:
    print(n-most_e-most_o)

Fixed submission:
import collections
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
a=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
ce=collections.Counter(arr_e).most_common()
co=collections.Counter(arr_o).most_common()
if len(arr_s)==1:
    print(int(n/2))
else:
    if ce[0][0]!=co[0][0]:
        print(n-ce[0][1]-co[0][1])
    else:
        print(n-max(ce[0][1]+co[1][1],ce[1][1]+co[0][1]))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
#print(arr)
a=0
most_e=0
most_o=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
#print(arr_e,arr_o)
arr_es=set(arr_e)
arr_os=set(arr_o)
#print(arr_es,arr_os)

for i in arr_es:
    cnt_e=arr_e.count(i)
    if cnt_e>most_e:
        most_e=cnt_e
        if cnt_e>=n/4:
            break
        
for i in arr_os:
    cnt_o=arr_o.count(i)
    if cnt_o>most_o:
        most_o=cnt_o
        if cnt_o>=n/4:
            break

#print(most_e,most_o)
if len(arr_s)==1:
    print(int(n/2))
else:
    print(n-most_e-most_o)

Fixed submission:
import collections
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
a=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
ce=collections.Counter(arr_e).most_common()
co=collections.Counter(arr_o).most_common()
if len(arr_s)==1:
    print(int(n/2))
else:
    if ce[0][0]!=co[0][0]:
        print(n-ce[0][1]-co[0][1])
    else:
        print(n-max(ce[0][1]+co[1][1],ce[1][1]+co[0][1]))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
arr=input().split(" ")
arr_s=set(arr)

#print(arr)
a=0
most_e=0
most_o=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
#print(arr_e,arr_o)
arr_es=set(arr_e)
arr_os=set(arr_o)
#print(arr_es,arr_os)

for i in arr_es:
    cnt_e=arr_e.count(i)
    if cnt_e>most_e:
        most_e=cnt_e
        
for i in arr_os:
    cnt_o=arr_o.count(i)
    if cnt_o>most_o:
        most_o=cnt_o

#print(most_e,most_o)
if len(arr_s)==1:
    print(int(n/2))
else:
    print(n-most_e-most_o)

Fixed submission:
import collections
n=int(input())
arr=input().split(" ")
arr_s=set(arr)
a=0
arr_e=[0 for i in range(int(n/2))]
arr_o=[0 for i in range(int(n/2))]
for i in range(int(n/2)):
    arr_e[i]=arr[a]
    arr_o[i]=arr[a+1]
    a+=2
ce=collections.Counter(arr_e).most_common()
co=collections.Counter(arr_o).most_common()
if len(arr_s)==1:
    print(int(n/2))
else:
    if ce[0][0]!=co[0][0]:
        print(n-ce[0][1]-co[0][1])
    else:
        print(n-max(ce[0][1]+co[1][1],ce[1][1]+co[0][1]))