qyliang/CodeNanoFix huggingface dataset:
Buggy code:
import sys
from heapq import heapify, heappop
read=sys.stdin.read

n,*a=map(int,read().split())
a.append(max(a)+1)
heapify(a)
x=heappop(a)
f=1
ans=0
while a:
  y=heappop(a)
  if x==y:
    f^=1
  else:
    ans+=1-f
    f=1
    x=y
print(ans)
    
    

Fixed code:
import sys
from heapq import heapify, heappop
read=sys.stdin.read

n,*a=map(int,read().split())
a.append(max(a)+1)
heapify(a)
x=heappop(a)
f=1
ans=0
while a:
  y=heappop(a)
  if x==y:
    f^=1
  else:
    ans+=f
    f=1
    x=y
print(ans)
Buggy code:
N = int(input())
s = [int(input()) for i in range(N)]

import collections
c = collections.Counter(s)
print(list(c.values()))
ans_lis = [x for x in list(c.values()) if x %2 != 0]
print(len(ans_lis))

Fixed code:
N = int(input())
s = [int(input()) for i in range(N)]

import collections
c = collections.Counter(s)

ans_lis = [x for x in list(c.values()) if x %2 != 0]
print(len(ans_lis))
Buggy code:
N = int(input())
A = set()
for i in range(N):
  x = int(input())
  if x in A:
    A.remove(x)
  else:
    A.append(x)
print(len(A))

Fixed code:
N = int(input())
A = set()
for i in range(N):
  x = int(input())
  if x in A:
    A.remove(x)
  else:
    A.add(x)
print(len(A))
Buggy code:
n=int(input())
A=set()
for i in range(n):
    a=input()
    if a in A:
        A.remove(a)
    else:
        A.append(a)
print(len(A))

Fixed code:
n=int(input())
A=set()
for i in range(n):
    a=input()
    if a in A:
        A.remove(a)
    else:
        A.add(a)
print(len(A))
Buggy code:
N = int(input())
A = [input() for _ in range(N)]
import collections
c = collections.Counter(A)
a = 0
for i in c.values():
  if i//2 == 0:
    continue
  else:
    a = a+1
    
print(a)

Fixed code:
N = int(input())
A = [input() for _ in range(N)]
import collections
c = collections.Counter(A)
a = 0
for i in c.values():
  if i%2 == 0:
    continue
  else:
    a = a+1
    
print(a)
Buggy code:
N = int(input())
A = {}
for i in range(N):
    a = int(input())
    if a in A:
        A[a] += 1
    else:
        A[a] = 1
ans = 0
for val in A.values:
    ans += val % 2
print(ans)


Fixed code:
N = int(input())
A = {}
for i in range(N):
    a = int(input())
    if a in A:
        A[a] += 1
    else:
        A[a] = 1
ans = 0
for val in A.values():
    ans += val % 2
print(ans)
Buggy code:
N=int(input())
S={}
for i in range(N):
    S=S^{input()}
print(len(S))

Fixed code:
N=int(input())
S=set()
for i in range(N):
    S^={input()}
print(len(S))
Buggy code:
N = int(input())
A = {}
for _ in range(N):
  a = int(input())
  if a in A:
    A[a] += 1
    A[a] %= 2
  else:
    A[a] = 0
ans=0
for key in A.keys():
  ans += A[key]
print(ans)
  
  
    

Fixed code:
N = int(input())
A = {}
for _ in range(N):
  a = int(input())
  if a in A:
    A[a] += 1
    A[a] %= 2
  else:
    A[a] = 1
ans=0
for key in A.keys():
  ans += A[key]
print(ans)
Buggy code:
n = int(input())

nlll = {}
    
for i in range(n):
    aaa = int(input())
    if nlll in aaa:
        del aaa
    else:
        nlll.update({aaa:1})

sums = 0
for i in nlll.values():
    sums = sums + i
print(sums)

Fixed code:
n = int(input())

nlll = {}
    
for i in range(n):
    aaa = int(input())
    if aaa in nlll:
        del nlll[aaa]
    else:
        nlll.update({aaa:1})

sums = 0
for i in nlll.values():
    sums = sums + i
print(sums)
Buggy code:
n = int(input())
l = []
 
for _ in range(n):
    a = int(input())
    l.append(a)

l.sort()
print(l)
ans = 0
cnt = 1
tmp = l[0]
for i in range(1,len(l)):
    if tmp == l[i]:
        cnt += 1
        tmp = l[i]
    else:
        if cnt%2 != 0:
            ans += 1
            cnt = 1
            tmp = l[i]
        else:
            cnt = 1
            tmp = l[i]

print(ans)

Fixed code:
n = int(input())
l = []
 
for _ in range(n):
    a = int(input())
    l.append(a)

l.sort()

ans = 0
cnt = 1
tmp = l[0]
for i in range(1,len(l)):
    if tmp == l[i]:
        cnt += 1
        tmp = l[i]
    else:
        if cnt%2 != 0:
            ans += 1
            cnt = 1
            tmp = l[i]
        else:
            cnt = 1
            tmp = l[i]
if cnt%2 != 0:
    ans += 1

print(ans)
Buggy code:
from collections import Counter
n = int(input())
a = [int(input()) for _ in range(n)]

cnt = Counter(a).value()


flg = 0
for i in cnt:
    if i%2 == 1:
        flg += 1

print(flg)

Fixed code:
from collections import Counter
n = int(input())
a = [int(input()) for _ in range(n)]

cnt = Counter(a).values()


flg = 0
for i in cnt:
    if i%2 == 1:
        flg += 1

print(flg)
Buggy code:
N = int(input())
s = set()
for i in range(N):
	a = input
	if a in s:
		s.remove(a)
	else:
		s.add(a)
print(len(s))

Fixed code:
N = int(input())
s = set()
for i in range(N):
	a = input()
	if a in s:
		s.remove(a)
	else:
		s.add(a)
print(len(s))
Buggy code:
n = int(input())
A = [int(input()) for i in range(n)]
 
B = set()
lenB = 0
for a in A:
    if a in B:
        B.remove(a)
        lenB -= 1
    else:
        b.add(a)
        lenB += 1
print(lenB)

Fixed code:
n = int(input())
A = [int(input()) for i in range(n)]

b = set()
lenB = 0
for a in A:
    b.add(a)
    lenB += 1
    if len(b) != lenB:
        b.remove(a)
        lenB -= 2
print(len(b))
Buggy code:
n = int(input())
a = [int(input()) for _ in range(n)]

from collections import Counter

c = Counter(a)

print(sum([1 for num,cnt in c.items() if cnt&2]))

Fixed code:
n = int(input())
a = [int(input()) for _ in range(n)]

from collections import Counter

c = Counter(a)
print(sum([1 for num,cnt in c.items() if cnt%2==1]))
Buggy code:
N = int(input())
A = []
d = {}
for i in range(N):
    a = int(input())
    d[a] = 0
    A.append(a)
S = []
for i in range(N):
    if d[A[i]] == 0:
        S.append(A[i])
    d[A[i]] += 1
ans = 0
for i in S:
    ans += (d[i]//2)
print(ans)

Fixed code:
N = int(input())
A = []
d = {}
for i in range(N):
    a = int(input())
    d[a] = 0
    A.append(a)
S = []
for i in range(N):
    if d[A[i]] == 0:
        S.append(A[i])
    d[A[i]] += 1
ans = 0
for i in S:
    ans += (d[i]%2)
print(ans)
Buggy code:
number_set = set()
N = int(input())

for i in range(N):
    new_num = input()
    if new_num in number_set:
        number_set.remove(new_num)
    else:
        number_set.add(new_num)

print(len(number_set))
print(number_set)

Fixed code:
number_set = set()
N = int(input())

for i in range(N):
    new_num = input()
    if new_num in number_set:
        number_set.remove(new_num)
    else:
        number_set.add(new_num)

print(len(number_set))
Buggy code:
n=int(input())
l=[]
for i in range(n):
  m=int(input())
  l.append(m)
c=0
d=0
e=l[0]
l=sorted(l)
for i in range(1,n):
  if l[i]!=e:
    if d%2==1:
      c+=1
    e=l[i]
    d=1
  else:
    d+=1
print(c)

Fixed code:
n=int(input())
l=[]
for i in range(n):
  m=int(input())
  l.append(m)
l=sorted(l)
c=0
d=1
e=l[0]
for i in range(1,n):
  if l[i]!=e:
    if d%2==1:
      c+=1
    e=l[i]
    d=1
  else:
    d+=1
if d%2==1:
  c+=1
print(c)
Buggy code:
n=int(input())
ans=set([])
for i in range(n):
    a=int(input())
    if a in ans:
        ans.remove(a)
    else:
        ans.append(a)
print(len(ans))


Fixed code:
n=int(input())
ans=set([])
for i in range(n):
    a=int(input())
    if a in ans:
        ans.remove(a)
    else:
        ans.add(a)
print(len(ans))
Buggy code:
from sys import stdin
from collections import Counter

n, *a = (int(x) for x in stdin.read().split())

count = 0
for v in Counter(a).values():
    if v % 2 == 0: count += 1

print(count)

Fixed code:
from sys import stdin
from collections import Counter

n, *a = (int(x) for x in stdin.read().split())

count = 0
for v in Counter(a).values():
    if v % 2 == 1: count += 1

print(count)
Buggy code:
from sys import stdin

n, *a = (int(x) for x in stdin.read().split())

each_count = {n: 0 for n in set(a)}


for n in a:
    each_count[n] += 1

count = 0
for v in each_count.values():
    if v % 2 == 0: count += 1

print(count)

Fixed code:
from sys import stdin

n, *a = (int(x) for x in stdin.read().split())

each_count = {n: 0 for n in set(a)}


for n in a:
    each_count[n] += 1

count = 0
for v in each_count.values():
    if v % 2 == 1: count += 1

print(count)
Buggy code:
from collections import Counter
n, *A = map(int, open(0).read().split())
ans = 0
for k, v in  Counter(A):
  if v % 2 == 1:
    ans += 1
print(ans)

Fixed code:
from collections import Counter
n, *A = map(int, open(0).read().split())
ans = 0
for v in  Counter(A).values():
  if v % 2 == 1:
    ans += 1
print(ans)
Buggy code:
def writeanderase(n , a):

    ans = {}

    for i in range(n):
        if a[i] in ans:
            ans[a[i]] += 1
        else:
            ans[a[i]] = 1

    for i in ans.values():
        count += i % 2

    return count

def main():
    n = int(input())
    a = [int(input()) for i in range(n)]
    print(writeanderase(n , a))

if __name__ == '__main__':
    main()

Fixed code:
def writeanderase(n , a):

    ans = {}
    count = 0

    for i in range(n):
        if a[i] in ans:
            ans[a[i]] += 1
        else:
            ans[a[i]] = 1

    for i in ans.values():
        count += i % 2

    return count

def main():
    n = int(input())
    a = [int(input()) for i in range(n)]
    print(writeanderase(n , a))

if __name__ == '__main__':
    main()
Buggy code:
n = int(input())
a = [int(input()) for i in range(n)]
dict = {}
for i in a:
    if i in dict:
        if i in dict:
            dict[i] += 1
        else:
            dict[i] = 1
ans = 0
for i in dict:
    if dict[i]%2==0:
        continue
    else:
        ans += 1
print(ans)

Fixed code:
n = int(input())
a = [int(input()) for i in range(n)]
dict = {}
for i in a:
    if i in dict:
        dict[i] += 1
    else:
        dict[i] = 1
ans = 0
for i in dict:
    if dict[i]%2==0:
        continue
    else:
        ans += 1
print(ans)
Buggy code:
n = int(input())
a = set([])
for i in range(n):
  k = int(input())
  if k in a:
    a.remove(k)
  else:
    a.add(k)
ans = len(a)
print(a)


Fixed code:
n = int(input())
a = set([])
for i in range(n):
  k = int(input())
  if k in a:
    a.remove(k)
  else:
    a.add(k)
ans = len(a)
print(ans)
Buggy code:
from collections import Counter
import numpy as np
n = int(input())
a_list = []
for _ in range(n):
    a_list.append(int(input()))

counter = Counter(a_list)
count = list(counter.values())
ar = np.array(count)
ar = ar % 2
ar.sum()


Fixed code:
from collections import Counter
import numpy as np
n = int(input())
a_list = []
for _ in range(n):
    a_list.append(int(input()))

counter = Counter(a_list)
count = list(counter.values())
ar = np.array(count)
ar = ar % 2
print(ar.sum())
Buggy code:
n = int(input())
m = set()
while n:
    x = int(input())
    if x in m:
        m.remove(x)
    else:
        m.add(x)
print(len(m))


Fixed code:
n = int(input())
m = set()
while n:
    x = int(input())
    if x in m:
        m.remove(x)
    else:
        m.add(x)
    n -= 1
print(len(m))
Buggy code:
# -*- coding: utf-8 -*-
a = int(input())
b = set()
for i in range(a):
	b ^= {input()}
	print(b)
print(len(b))

Fixed code:
# -*- coding: utf-8 -*-
a = int(input())
b = set()
for i in range(a):
	b ^= {input()}
print(len(b))
Buggy code:
n=int(input())
list=[]
ans=0
for i in range(n):
    a=int(input())
    list.append(a)
list=sorted(list)
for i in range(n):
    sa=0
    if i!=0:
        if list[i]==list[i-1]:
            sa+=1
    if sa%2!=0:
        ans+=1
print(ans)

Fixed code:
n=int(input())
list=[]
ans=0
sa=1
sas=0
for i in range(n):
    a=int(input())
    list.append(a)
list=sorted(list)
list.append(10000000000)
for i in range(n+1):
    if i!=0:
        if list[i]==list[i-1]:
            sa+=1
        else:
            sas=sa
            sa=1
            if sas%2!=0:
                ans+=1
print(ans)
Buggy code:
n=int(input())
a={}
for i in range(n):
    b=int(input())
    if b in a[b]:
        del a[b]
    else:
        a[b]=1

print(len(a))

Fixed code:
n=int(input())
a={}
for i in range(n):
    b=int(input())
    if b in a:
        del a[b]
    else:
        a[b]=1

print(len(a))
Buggy code:
import collections
c=Counter()
N=int(input())
for i in range(N):
    c[int(input())]+=1
d=list(filter(lambda x:c[x]%2==1,c))
print(len(d))

Fixed code:
import collections
c=collections.Counter()
N=int(input())
for i in range(N):
    c[int(input())]+=1
d=list(filter(lambda x:c[x]%2==1,c))
print(len(d))
Buggy code:
from collections import Counter
n = int(input())
a = Counter(list(int(input()) for i in range(n)))
print(sum(x % 2 == 0 for x in a.values()))

Fixed code:
from collections import Counter
n = int(input())
a = Counter(list(int(input()) for i in range(n)))
print(sum(x % 2 != 0 for x in a.values()))
Buggy code:
n=int(input())
a=set()
for i in range(n):
    b=int(input())
    if b in a:
        a.remove(b)
    else:
        a.append(b)
print(len(a))

Fixed code:
n=int(input())
a=set()
for i in range(n):
    b=int(input())
    if b in a:
        a.remove(b)
    else:
        a.add(b)
print(len(a))
Buggy code:
#!/usr/bin/env python3

import sys

sys.setrecursionlimit(10**7)


def read_h(typ=int):
    return list(map(typ, input().split()))


def read_v(n, m=1, typ=int):
    return [read_h() if m > 1 else typ(input()) for _ in range(n)]


def main():
    N, = read_h()
    A = read_v(N)

    cnts = {}
    for a in A:
        cnts[a] = cnts.get(a, 0) + 1

    print(cnts)

    ans = 0
    for n in cnts.values():
        if n % 2 != 0:
            ans += 1

    print(ans)


if __name__ == '__main__':
    main()


Fixed code:
#!/usr/bin/env python3

import sys

sys.setrecursionlimit(10**7)


def read_h(typ=int):
    return list(map(typ, input().split()))


def read_v(n, m=1, typ=int):
    return [read_h() if m > 1 else typ(input()) for _ in range(n)]


def main():
    N, = read_h()
    A = read_v(N)

    cnts = {}
    for a in A:
        cnts[a] = cnts.get(a, 0) + 1

    #  print(cnts)

    ans = 0
    for n in cnts.values():
        if n % 2 != 0:
            ans += 1

    print(ans)


if __name__ == '__main__':
    main()
Buggy code:
import sys
n=int(input())
a=[[int(i) for i in l] for l in sys.stdin]
a.sort()
stack=a[0]
num=1
ans=0
for i in range(1,n):
  if a[i]==stack:
    num+=1
  else:
    if num%2==1:
      ans+=1
    stack=a[i]
    num=1
if num%2==1:
  ans+=1
print(ans)

Fixed code:
import sys
n=int(input())
a=[int(i) for i in sys.stdin]
a.sort()
stack=a[0]
num=1
ans=0
for i in range(1,n):
  if a[i]==stack:
    num+=1
  else:
    if num%2==1:
      ans+=1
    stack=a[i]
    num=1
if num%2==1:
  ans+=1
print(ans)
Buggy code:
N = int(input())
ans = 0
n = []
for i in range(N):
  n.append(int(input()))
n.sort()
i=0
cnt = 1
while(i<N-1):
  print(cnt)
  if n[i] == n[i+1]:
    cnt+=1
  else:
    if cnt%2==1:
      ans+=1
      cnt = 1
  i+=1
if cnt%2==1:
  ans+=1

print(ans)

Fixed code:
N = int(input())
ans = 0
n = []
for i in range(N):
  n.append(int(input()))
n.sort()
i=0
cnt = 1
while(i<N-1):
  if n[i] == n[i+1]:
    cnt+=1
  else:
    if cnt%2==1:
      ans+=1
    cnt = 1
    
  i+=1
if cnt%2==1:
  ans+=1

print(ans)
Buggy code:
n = int(input())

dic = {}

for i in range(n):
    a = int(input())
    if dic.get(a) is None:
        dic[a] = 1
    else:
        dic[a] += 1 %2
        
    
val = list(dic.values())
ans = int(sum(val))

print(ans)

Fixed code:
n = int(input())

dic = {}

for i in range(n):
    a = int(input())
    if dic.get(a) is None:
        dic[a] = 1
    else:
        dic[a] = (dic[a] + 1)%2
        
    
val = list(dic.values())
ans = int(sum(val))

print(ans)
Buggy code:
#ABC073C
N=int(input())
A=[int(input()) for i in range(N)]
A_sorted=sorted(A)
count=1
ans=0
for i in range(N-1):
    if A_sorted[i]==A_sorted[i+1]:
        count+=1
    else
        ans+=count%2
        count=1
ans+=count%2
print(ans)


Fixed code:
#ABC073C
N=int(input())
A=[int(input()) for i in range(N)]
A_sorted=sorted(A)
count=1
ans=0
for i in range(N-1):
    if A_sorted[i]==A_sorted[i+1]:
        count+=1
    else:
        ans+=count%2
        count=1
ans+=count%2
print(ans)
Buggy code:
N = int(input())

A = []
for _ in range(N):
    A.append(int(input()))

if N == 1:
    print(1)
    exit()
    
A.sort()

current_number = A[0]
current_count = 1
count = 0

for i in range(1,N):
    if current_number == A[i]:
        current_count += 1
    else:
        current_number = A[i]
        if current_count % 2 != 0:
            count += 1
        current_count = 0

print(count)

Fixed code:
N = int(input())

A = []
for _ in range(N):
    A.append(int(input()))

if N == 1:
    print(1)
    exit()

A.sort()

current_number = A[0]
current_count = 1
ans = 0

for i in range(1,N-1):
    if current_number == A[i]:
        current_count += 1
    else:
        current_number = A[i]
        if current_count % 2 != 0:
            ans += 1
        current_count = 1

if current_number == A[N-1]:
    current_count += 1
    if current_count % 2 != 0:
            ans += 1
else:
    if current_count % 2 != 0:
            ans += 1
    ans += 1
print(ans)
Buggy code:
n = int(input())
dic = {}
for _ in range(n):
  tmp = int(input())
  if tmp in dic and dic[tmp] == 1:
    dic[tmp] == 0
  else:
    dic[tmp] = 1
print(sum([*dic.values()]))

Fixed code:
n = int(input())
dic = {}
for _ in range(n):
  tmp = int(input())
  if tmp in dic and dic[tmp] == 1:
    dic[tmp] = 0
  else:
    dic[tmp] = 1
print(sum(dic.values()))
Buggy code:
import collections
ans = 0
n = int(input())
nums = [int(input()) for i in range(n)]
con = collections.Counter(nums)

for i in con.values():
  if i % 2 == 0:
    ans += 1
print(ans)

Fixed code:
import collections
ans = 0
n = int(input())
nums = [int(input()) for i in range(n)]
con = collections.Counter(nums)

for i in con.values():
  if i % 2 != 0:
    ans += 1
print(ans)
Buggy code:
n=int(input())
count=0
li=[0 for i in range(n)]
for i in range(n):
    a=int(input())
    li[i]=a
li.sort()
i=0
x=1
while i<n-1:
    if li[i]==li[i+1]:
        x+=1
    else:
        x=1
    if x%2==1:
        count+=1
    i+=x
print(count)

Fixed code:
n=int(input())
count=0
li=[0 for i in range(n)]
for i in range(n):
    a=int(input())
    li[i]=a
li.sort()
i=0
x=1
while i<n-1:
    if li[i]==li[i+1]:
        x+=1
        if i+2==n-1:
            count+=1
    else:
        x=1
        if i+1==n-1:
            count+=1
    if x%2==1:
        count+=1
    i+=x
    x=1
print(count)
Buggy code:
data=[int(input()) for i in range(int(input()))]
data.sort()
count=0
value=1
predata=None
for i in range(0,len(data)):
    if predata==data[i]:
        value+=1
    else:
        predata=data[i]
        count+=value%2
        value=1
print(count)


Fixed code:
data=[int(input()) for i in range(int(input()))]
data.sort()
count=-1
value=1
predata=None
for i in range(0,len(data)):
    if predata!=data[i]:
        count+=value%2
        value=1
    else:
        value+=1
    predata=data[i]
count+=value%2
print(count)
Buggy code:
n=int(input())
d={}
for i in range(n):
  A=int(input())
  if A not in d:
    d[A]=1
  elif d[A]==1:
    d[A]==0
  else:
    d[A]=1
print(sum(d.values()))

Fixed code:
n=int(input())
d={}
for i in range(n):
  A=int(input())
  if A not in d:
    d[A]=1
  elif d[A]==1:
    d[A]=0
  else:
    d[A]=1
print(sum(d.values()))
Buggy code:
from collections import Counter
n = int(input())
l = []
for i in range(n):
   l.append(int(input()))
lcnt = Counter(l)
l_value = list(lcnt.values())
for i in range(len(l_value)):
   if  l_value[i]%2 == 0:
       l_value[i] = 0
  else:
       l_value[i] = 1    
print(sum(l_value))


Fixed code:
from collections import Counter
n = int(input())
l = []
for i in range(n):
   l.append(int(input()))
lcnt = Counter(l)
l_value = list(lcnt.values())
for i in range(len(l_value)):
  if l_value[i]%2 == 0:
    l_value[i] = 0
  else:
    l_value[i] = 1    
print(sum(l_value))
Buggy code:
import sys
import math

if sys.platform =='ios':
    sys.stdin=open('input_file.txt')
   
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N=int(input())
cnt=0
li=[]

for _ in range(N):
	li.append(int(input()))
	
so=sorted(li)
ct=1
print(so)

for i in range(N-1):
	if so[i]==so[i+1]:
		ct+=1
	else:
		if ct%2==1:
			cnt+=1
		ct=1

if N==1:
	print(1)
else:	
	print(cnt)
			


Fixed code:
import sys
import math

if sys.platform =='ios':
    sys.stdin=open('input_file.txt')
   
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N=int(input())
cnt=0
li=[]

for _ in range(N):
	li.append(int(input()))
	
so=sorted(li)
ct=1

for i in range(N-1):
	if so[i]==so[i+1]:
		ct+=1
	else:
		cnt+=ct%2
		ct=1
		
cnt+=ct%2



if N==1:
	print(1)
else:	
	print(cnt)
Buggy code:
N = int(input())
aset = set()
for _ in range(N):
    a = int(input())
    if a in aset():
        aset.remove(a)
    else:
        aset.add(a)
print(len(aset))

Fixed code:
N = int(input())
aset = set()
for _ in range(N):
    a = int(input())
    if a in aset:
        aset.remove(a)
    else:
        aset.add(a)
print(len(aset))
Buggy code:
from collections import Counter

A = [int(input()) for _ in range(int(input()))]
C = Counter(A)

ans = 0
for c in C.values():
    ans += 1 if c%2 == 0 else 0
print(ans)

Fixed code:
from collections import Counter

A = [int(input()) for _ in range(int(input()))]
C = Counter(A)

ans = 0
for c in C.values():
    if c%2 == 1:
        ans += 1
print(ans)
Buggy code:
from collections import defaultdict
readline = sys.stdin.buffer.readline
N = int(readline())

NUMBERS = defaultdict(bool)

for _ in range(N):
  n = int(readline())
  NUMBERS[n] = not NUMBERS[n]

ans = 0
for k,v in NUMBERS.items():
  if v:
    ans += 1

print(ans)

Fixed code:
import sys
from collections import defaultdict
readline = sys.stdin.buffer.readline
N = int(readline())

NUMBERS = defaultdict(bool)

for _ in range(N):
  n = int(readline())
  NUMBERS[n] = not NUMBERS[n]

ans = 0
for k,v in NUMBERS.items():
  if v:
    ans += 1

print(ans)
Buggy code:
from collections import Counter

N = int(input())
A = [int(input()) for _ in range(N)]
c = Counter(A)
print(len([i for i in c if c.values(i) % 2 == 1]))


Fixed code:
from collections import Counter

N = int(input())
A = [int(input()) for _ in range(N)]
c = Counter(A).values()

print(len([i for i in c if i % 2 == 1]))
Buggy code:
n = int(input())
list_ = [int(input()) for _ in range(n)]

dict_ = dict()
for key in set(list_):
    dict_[key] += dict_.get(key, 0) + 1
print(sum(num % 2 for num in dict_.values()))

Fixed code:
n = int(input())
list_ = [int(input()) for _ in range(n)]

dict_ = dict()
for key in list_:
    dict_[key] = dict_.get(key, 0) + 1
print(sum(num % 2 for num in dict_.values()))
Buggy code:
N=int(input())
from collections import defaultdict
d=defaultdict(int)
for i in range(N):
    d[int(input())]+=1
cnt=1
for a in d.keys():
    if d[a]%2==1:
        cnt+=1
print(cnt)

Fixed code:
N=int(input())
from collections import defaultdict
d=defaultdict(int)
for i in range(N):
    d[int(input())]+=1
cnt=0
for a in d.keys():
    if d[a]%2==1:
        cnt+=1
print(cnt)
Buggy code:
N = int(input())
a = [int(input()) for _ in range(N)]
a.sort
ans = 0
now = 0
cnt = 0
for x in a:
    if x == now:
        cnt += 1
        continue
    if cnt % 2 == 1:
        ans += 1
    cnt = 1
if cnt % 2 == 1:
    ans += 1
print(ans)

Fixed code:
N = int(input())
a = [int(input()) for _ in range(N)]
a.sort()
ans = 0
now = 0
cnt = 0
for x in a:
    if x == now:
        cnt += 1
        continue
    if cnt % 2 == 1:
        ans += 1
    cnt = 1
    now = x
if cnt % 2 == 1:
    ans += 1
print(ans)
Buggy code:
from collections import Counter

if __name__ == '__main__':
    N = int(input())
    A = []
    for i in range(N):
        A.append(int(input()))

    counter_a = Counter(A)

    ans = 0
    for count in counter_a.values():
        if count % 2 == 0:
            ans += 1

    print(ans)


Fixed code:
from collections import Counter

if __name__ == '__main__':
    N = int(input())
    A = []
    for i in range(N):
        A.append(int(input()))

    counter_a = Counter(A)

    ans = 0
    for count in counter_a.values():
        if count % 2 != 0:
            ans += 1
    # print(counter_a.values())
    print(ans)