Buggy python submission (verdict: Time Limit Exceeded):
import math
import copy
import sys
import fractions
import numpy as np
from functools import reduce

# ===FUNCTION===

def getInputInt():
    inputNum = int(input())
    return inputNum

def getInputListInt():
    outputoData = []
    inputData = input().split()
    outputData = [int(n) for n in inputData]

    return outputData

def getSomeInputInt(n):
    outputDataList = []
    for i in range(n):
        inputData = int(input())
        outputDataList.append(inputData)

    return outputDataList

def getSomeInputListInt(n):
    inputDataList = []
    outputDataList = []
    for i in range(n):
        inputData = input().split()
        inputDataList = [int(n) for n in inputData]
        outputDataList.append(inputDataList)

    return outputDataList

# ===CODE===

n, = map(int, input().split())
data = getInputListInt()

param = []
tmpparam = []
onelist = []
twolist = []

tmp = 0
for i in range(n):
    if tmpparam.count(data[i]) == 0:
        param.append([data[i], 0, 0])
        tmpparam.append(data[i])

if len(param)==1:
    param.append([0, 0, 0])

for i in range(len(param)):
    for j in range(n):
        if j%2==0:
            if data[j]!=param[i][0]:
                param[i][1]+=1
        else:
            if data[j]!=param[i][0]:
                param[i][2]+=1

srtlist = sorted(param, key=lambda x:x[1])
onemin1 = [srtlist[0][0], srtlist[0][1]]
onemin2 = [srtlist[1][0], srtlist[1][1]]

srtlist = sorted(param, key=lambda x:x[2])
twomin1 = [srtlist[0][0], srtlist[0][2]]
twomin2 = [srtlist[1][0], srtlist[1][2]]

if onemin1[0] != twomin1[0]:
    print(onemin1[1]+twomin1[1])
else:
    print(min(onemin1[1]+twomin2[1], onemin2[1]+twomin1[1]))


Fixed submission:
import math
import copy
import sys
import fractions
import numpy as np
from functools import reduce

# ===FUNCTION===

def getInputInt():
    inputNum = int(input())
    return inputNum

def getInputListInt():
    outputoData = []
    inputData = input().split()
    outputData = [int(n) for n in inputData]

    return outputData

def getSomeInputInt(n):
    outputDataList = []
    for i in range(n):
        inputData = int(input())
        outputDataList.append(inputData)

    return outputDataList

def getSomeInputListInt(n):
    inputDataList = []
    outputDataList = []
    for i in range(n):
        inputData = input().split()
        inputDataList = [int(n) for n in inputData]
        outputDataList.append(inputDataList)

    return outputDataList

# ===CODE===

n, = map(int, input().split())
data = getInputListInt()

onedic = {0:0}
twodic = {0:0}

for i in range(n):
    if i % 2 ==0:
        onedic[data[i]]=0
    else:
        twodic[data[i]]=0

for i in range(n):
    if i % 2 ==0:
        onedic[data[i]]+=1
    else:
        twodic[data[i]]+=1

onemax = max(onedic, key=onedic.get)
twomax = max(twodic, key=twodic.get)

onemax = sorted(onedic.items(), key = lambda x:x[1], reverse=True)
twomax = sorted(twodic.items(), key = lambda x:x[1], reverse=True)

ans = 0
if onemax[0][0] != twomax[0][0]:
    ans = n - onemax[0][1] - twomax[0][1]
else:
    ans = min(n - onemax[0][1] - twomax[1][1], n - onemax[1][1] - twomax[0][1])

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import math
import copy
import sys
import fractions
import numpy as np
from functools import reduce

# ===FUNCTION===

def getInputInt():
    inputNum = int(input())
    return inputNum

def getInputListInt():
    outputoData = []
    inputData = input().split()
    outputData = [int(n) for n in inputData]

    return outputData

def getSomeInputInt(n):
    outputDataList = []
    for i in range(n):
        inputData = int(input())
        outputDataList.append(inputData)

    return outputDataList

def getSomeInputListInt(n):
    inputDataList = []
    outputDataList = []
    for i in range(n):
        inputData = input().split()
        inputDataList = [int(n) for n in inputData]
        outputDataList.append(inputDataList)

    return outputDataList

# ===CODE===

n, = map(int, input().split())
data = getInputListInt()

param = []

tmp = 0
for i in range(n):
    if param.count(data[i])==0:
        param.append(data[i])

if len(param)==1:
    param.append(0)

ans = sys.maxsize

for i in range(len(param)):
    one = param[i]
    for j in range(len(param)):
        if i == j:
            continue

        two = param[j]
        cnt = 0
        for k in range(n):
            if k % 2 == 0:
                if data[k] != one:
                    cnt+=1
            else:
                if data[k] != two:
                    cnt+=1

        ans = min(ans, cnt)

print(ans)



Fixed submission:
import math
import copy
import sys
import fractions
import numpy as np
from functools import reduce

# ===FUNCTION===

def getInputInt():
    inputNum = int(input())
    return inputNum

def getInputListInt():
    outputoData = []
    inputData = input().split()
    outputData = [int(n) for n in inputData]

    return outputData

def getSomeInputInt(n):
    outputDataList = []
    for i in range(n):
        inputData = int(input())
        outputDataList.append(inputData)

    return outputDataList

def getSomeInputListInt(n):
    inputDataList = []
    outputDataList = []
    for i in range(n):
        inputData = input().split()
        inputDataList = [int(n) for n in inputData]
        outputDataList.append(inputDataList)

    return outputDataList

# ===CODE===

n, = map(int, input().split())
data = getInputListInt()

onedic = {0:0}
twodic = {0:0}

for i in range(n):
    if i % 2 ==0:
        onedic[data[i]]=0
    else:
        twodic[data[i]]=0

for i in range(n):
    if i % 2 ==0:
        onedic[data[i]]+=1
    else:
        twodic[data[i]]+=1

onemax = max(onedic, key=onedic.get)
twomax = max(twodic, key=twodic.get)

onemax = sorted(onedic.items(), key = lambda x:x[1], reverse=True)
twomax = sorted(twodic.items(), key = lambda x:x[1], reverse=True)

ans = 0
if onemax[0][0] != twomax[0][0]:
    ans = n - onemax[0][1] - twomax[0][1]
else:
    ans = min(n - onemax[0][1] - twomax[1][1], n - onemax[1][1] - twomax[0][1])

print(ans)