qyliang/CodeNanoFix huggingface dataset:
Buggy code:
import collections

n = int(input())
a = [input() for i in range(n)]
 
count = 0
dic = collections.Counter(l)
 
for i in dic.values():
    if i%2 == 1:
        count += 1
 
print(count)

Fixed code:
import collections
 
n = int(input())
a = [input() for i in range(n)]
 
count = 0
dic = collections.Counter(a)
 
for i in dic.values():
    if i%2 == 1:
        count += 1
 
print(count)
Buggy code:
# coding;utf-8

n=int(input())
ans_dict={}
for i in range(0, n):
    a=input()
    if not a in ans_dict:
        ans_dict[a]=1
    else:
        ans_dict[a]+=1
sum=0
for thing in ans_dict:
    if thing%2:
        sum+=0


Fixed code:
# coding;utf-8

n=int(input())
ans_dict={}
for i in range(0, n):
    a=input()
    if not a in ans_dict:
        ans_dict[a]=1
    else:
        ans_dict[a]+=1
sum=0
for thing in ans_dict:
    if ans_dict[thing]%2:
        sum+=1
print(sum)
Buggy code:
N=int(input())
A=[int(input()) for x in range(N)]
y=set()
for i in A:
    if i in y:
        y.remove(i)
    else:
        y.append(i)
print(len(y))


Fixed code:
N=int(input())
A=[int(input()) for x in range(N)]
y=set()
for i in A:
    if i in y:
        y.remove(i)
    else:
        y.add(i)
print(len(y))
Buggy code:
time = int(input())
ans = []
n = 0
for i in range(time):
    ans.append(input())
ans.sort(key=int)
while n+1 < len(ans):
    if ans[n] == ans[int(n + 1)]:
        ans.pop(n)
        ans.pop(n)
    else:
        n += 1
print(len(ans),ans)

Fixed code:
time = int(input())
ans = []
n = 0
for i in range(time):
    ans.append(input())
ans.sort(key=int)
while n+1 < len(ans):
    if ans[n] == ans[int(n + 1)]:
        ans.pop(n)
        ans.pop(n)
    else:
        n += 1
print(len(ans))
Buggy code:
def c(s):
    n = input()
    if n in s:
        s.remove(n)
    else:
        s.add(n)

def main():
    n = int(input())
    s = set()

    for i in range(n):
        c(s)

    return print(s)


if __name__ == '__main__':
    main()


Fixed code:
def c(s):
    n = input()
    if n in s:
        s.remove(n)
    else:
        s.add(n)

def main():
    n = int(input())
    s = set()

    for i in range(n):
        c(s)

    print(len(s))


if __name__ == '__main__':
    main()
Buggy code:
import collections
import itertools
import numpy as np
import sys
MAX_INT = int(10e10)
def IL(): return list(map(int,input().split()))
def SL(): return input().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

N = I()
l = [I() for i in range(N)]
l.sort()

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

print(ans)

Fixed code:
import collections
import itertools
import numpy as np
import sys
MAX_INT = int(10e10)
def IL(): return list(map(int,input().split()))
def SL(): return input().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

N = I()
l = [I() for i in range(N)]
l.sort()


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

    print(ans)
Buggy code:
# -*- coding: utf-8 -*-
"""
Created on Fri Aug 10 05:13:17 2018

@author: Yuki
"""

import collections

N = int(input())

A = [int(input()) for i in range(N)]

A_dict = collections.Counter(A)

cnt = 0
for val in A_dict.values:
    if val%2==1:
        cnt += 1
print(cnt)

Fixed code:
# -*- coding: utf-8 -*-
"""
Created on Fri Aug 10 05:13:17 2018

@author: Yuki
"""

import collections

N = int(input())

A = [int(input()) for i in range(N)]

A_dict = collections.Counter(A)

cnt = 0
for val in A_dict.values():
    if val%2==1:
        cnt += 1
print(cnt)
Buggy code:
import math, string, itertools, fractions, heapq, collections, re,  array, bisect, sys, random, time, copy, functools
sys.setrecursionlimit(10**7)
inf = 10 ** 20
eps = 1.0 / 10**10
mod = 10**9+7
dd = [(-1, 0), (0, 1), (1, 0), (0, -1)]
ddn = [(-1, 0), (-1, 1), (0, 1), (1, 1), (1, 0), (1, -1), (0, -1), (-1, -1)]
def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def pf(s): return print(s, flush=True)

N=I()
A=[I() for i in range(N)]
counts = collections.Counter(A)
ans=0
for i in counts.values():
    if values%2 == 1: 
        ans += 1
print(ans)


Fixed code:
import math, string, itertools, fractions, heapq, collections, re,  array, bisect, sys, random, time, copy, functools
sys.setrecursionlimit(10**7)
inf = 10 ** 20
eps = 1.0 / 10**10
mod = 10**9+7
dd = [(-1, 0), (0, 1), (1, 0), (0, -1)]
ddn = [(-1, 0), (-1, 1), (0, 1), (1, 1), (1, 0), (1, -1), (0, -1), (-1, -1)]
def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def pf(s): return print(s, flush=True)

N=I()
A=[I() for i in range(N)]
counts = collections.Counter(A)
ans=0
for i in counts.values():
    if i%2 == 1: 
        ans += 1
print(ans)
Buggy code:
N = int(input())


ds = {}
for _ in range(N):
    A = input()
    if A not in ds:
        ds[A] = 0
    else:
        ds[A] += 1
print(ds)
cnt = 0
for d in ds:
    if ds[d] % 2 == 0:
        cnt += 1

print(cnt)

Fixed code:
N = int(input())


ds = {}
for _ in range(N):
    A = input()
    if A not in ds:
        ds[A] = 0
    else:
        ds[A] += 1

cnt = 0
for d in ds:
    if ds[d] % 2 == 0:
        cnt += 1

print(cnt)
Buggy code:
n = int(input())
nums = [int(input()) for _ in range(n)]
cnt = {}
ans = 0
for x in nums:
    if x not in cnt:
        cnt[x] = 1
    else:
        cnt[x] += 1
for y in cnt.values():
    if cnt[y] % 2 != 0:
        ans += 1

print(ans)

Fixed code:
n = int(input())
nums = [int(input()) for _ in range(n)]
cnt = {}
ans = 0
for x in nums:
    if x not in cnt:
        cnt[x] = 1
    else:
        cnt[x] += 1
for y in cnt.values():
    if y % 2 != 0:
        ans += 1

print(ans)
Buggy code:
import collections

def test():
    n = int(input())
    a = [int(input()) for i in range(n)]
    b = collections.Counter(a)
    print(b)
    ans = 0
    for i in b.values():
        if i % 2 != 0:
            ans += 1
    print(ans)


if __name__ == "__main__":
    test()


Fixed code:
import collections

def test():
    n = int(input())
    a = [int(input()) for i in range(n)]
    b = collections.Counter(a)
    ans = 0
    for i in b.values():
        if i % 2 != 0:
            ans += 1
    print(ans)


if __name__ == "__main__":
    test()
Buggy code:
n = int(input())
a = [int(input()) for i in range(n)]
import collections
b = collections.Counter(a)
set_a = set(a)
cnt = 0
for i in range(len(set_a)):
    if b[a[i]]%2 == 1:
        cnt += 1
print(cnt)

Fixed code:
n = int(input())
a = [int(input()) for i in range(n)]
import collections
b = collections.Counter(a)
set_a = list(set(a))
cnt = 0
for i in range(len(set_a)):
    if b[set_a[i]]%2 == 1:
        cnt += 1
print(cnt)
Buggy code:
n = int(input())
a = sorted([int(input()) for _ in range(n)])
ans = 0
count = 0
pre = a[0]

for i in range(n):
    if a[i] == memo:
        count+=1
    else:
        pre = a[i]
        if count%2 == 1:
            ans += 1
        count = 1
if count%2 == 1:
    ans += 1
print(ans)


Fixed code:
n = int(input())
a = sorted([int(input()) for _ in range(n)])
ans = 0
count = 0
pre = a[0]

for i in range(n):
    if a[i] == pre:
        count+=1
    else:
        pre = a[i]
        if count%2 == 1:
            ans += 1
        count = 1
if count%2 == 1:
    ans += 1
print(ans)
Buggy code:
n = int(input())
a = {}
for i in range(n):
    b = int(input())
    if b in a.keys():
        a[b] += 1
    else:
        a[b] = 0
ans = 0
for i in a.keys():
    if a[i]%2 == 1:
        ans += 1
print(ans)

Fixed code:
n = int(input())
a = {}
for i in range(n):
    b = int(input())
    if b in a.keys():
        a[b] += 1
    else:
        a[b] = 1
ans = 0
for i in a.keys():
    if a[i]%2 == 1:
        ans += 1
print(ans)
Buggy code:
n = int(input())
a = []
ans = 0
for i in range(n):
  a.append(int(input()))
a.sort()
i = 0
jud = 1
q = [a[0]]
ans = 0
for i in range(1,):
  if(q[-1]==a[i+1]):
    jud += 1
  else:
    if(jud%2==1):
      ans += 1
    jud = 1
print(ans)
    
  


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

a.sort()
a.append(0)
erased = 0
ans = 0
for i in range(1,n+1):
    if a[i-1] == a[i]:
        erased = (erased+1)%2
    else:
        if erased == 0:
            ans += 1
        erased = 0
print(ans)
Buggy code:
n = int(input())
l = set()

for _ in range(n):
    a = int(input())

    if a in l:
        l.remove(a)
    else:
        l.append(a)

print(len(l))


Fixed code:
n = int(input())
l = set()

for _ in range(n):
    a = int(input())

    if a in l:
        l.remove(a)
    else:
        l.add(a)

print(len(l))
Buggy code:
a.sort()
count = 0
temp = a[0]
tempcount = 1
for i in range(1,n):
    if a[i]==temp:
        tempcount += 1
    else:
        if not tempcount%2 == 0:
            count += 1
        tempcount = 1
    temp = a[i]
    #print(i,tempcount)
if tempcount%2 == 1:
    count += 1
print(count)

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

a.sort()
count = 0
temp = a[0]
tempcount = 1
for i in range(1,n):
    if a[i]==temp:
        tempcount += 1
    else:
        if not tempcount%2 == 0:
            count += 1
        tempcount = 1
    temp = a[i]
    #print(i,tempcount)
if tempcount%2 == 1:
    count += 1
print(count)
Buggy code:
# ABC073C - Write and Erase
def main():
    N, *A = map(int, open(0).read().split())
    store = set()
    for a in range(n):
        if a in store:
            store.remove(a)
        else:
            store.add(a)
    ans = len(store)
    print(ans)


if __name__ == "__main__":
    main()

Fixed code:
# ABC073C - Write and Erase
def main():
    N, *A = map(int, open(0).read().split())
    store = set()
    for a in A:
        if a in store:
            store.remove(a)
        else:
            store.add(a)
    ans = len(store)
    print(ans)


if __name__ == "__main__":
    main()
Buggy code:
N=int(input())

from collections import defaultdict
d = defaultdict(int)

for _ in range(N):
    d[int(input())] += 1

ams=0
for i in d.values():
    i%2==1:
    ans+=1

print(ans)

Fixed code:
N=int(input())

from collections import defaultdict
d = defaultdict(int)

for _ in range(N):
    d[int(input())] += 1

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

print(ans)
Buggy code:
    n=int(input())
    buff=set()
    for i in range(n):
        a=int(input())
        if a in buff:
            buff.remove(a)
        else:
            buff.add(a)
     
    print(len(buff))

Fixed code:
n=int(input())
buff=set()
for i in range(n):
    a=int(input())
    if a in buff:
        buff.remove(a)
    else:
        buff.add(a)

print(len(buff))
Buggy code:
mport sys
import collections
input=sys.stdin.readline

n=int(input())
l=[int(input()) for i in range(n)]
ls=collections.Counter(l)
#print(ls)
a=0
for value in ls.values():
    if value%2==1:
        a+=1
print(a)

Fixed code:
import sys
import collections
input=sys.stdin.readline

n=int(input())
l=[int(input()) for i in range(n)]
ls=collections.Counter(l)
#print(ls)
a=0
for value in ls.values():
    if value%2==1:
        a+=1
print(a)
Buggy code:
n=int(input())
a=[]
for i in range(n):
  a.append(int(input()))
from collentions import Counter
b=list(Counter(a).values())
cnt=0
for i in range(len(b)):
  if b[i]%2==0:
    cnt+=1
print(cnt)


Fixed code:
n=int(input())
a=[]
for i in range(n):
  a.append(int(input()))
from collections import Counter
b=list(Counter(a).values())
cnt=0
for i in range(len(b)):
  if b[i]%2==1:
    cnt+=1
print(cnt)
Buggy code:
a =set()
n = int(input())
for _ in range(n):
    tmp = int(input()) 
    if tmp in a:
        a.remove(tmp)
    else:
        a.append(tmp)
print(len(a))

Fixed code:
a =set()
n = int(input())
for _ in range(n):
    tmp = int(input()) 
    if tmp in a:
        a.remove(tmp)
    else:
        a.add(tmp)
print(len(a))
Buggy code:
import collections
n = int(input())
alist = [int(input()) for i in range(n)]
cole = collections.Counters(alist)
count = 0
for i in cole.values():
  if i%2==1:
    count+=1
print(count)

Fixed code:
import collections
n = int(input())
alist = [int(input()) for i in range(n)]
cole = collections.Counter(alist)
count = 0
for i in cole.values():
  if i%2==1:
    count+=1
print(count)
Buggy code:
N = int(input())
list={}
for i in range(N):
    list ^= {int(input())}
print(len(list))

Fixed code:
N = int(input())
list=set()
for i in range(N):
    list ^= {int(input())}
print(len(list))
Buggy code:
import sys
import math
import itertools
import collections
import heapq
import re
import numpy as np
from functools import reduce

rr = lambda: sys.stdin.readline().rstrip()
rs = lambda: sys.stdin.readline().split()
ri = lambda: int(sys.stdin.readline())
rm = lambda: map(int, sys.stdin.readline().split())
rl = lambda: list(map(int, sys.stdin.readline().split()))
inf = float('inf')
mod = 10**9 + 7

n = ri()
cnt = 0
for v in collections.Counter([ri() for _ in range(n)]).values():
    if v&1==0:
        cnt += 1
print(cnt)















Fixed code:
import sys
import math
import itertools
import collections
import heapq
import re
import numpy as np
from functools import reduce

rr = lambda: sys.stdin.readline().rstrip()
rs = lambda: sys.stdin.readline().split()
ri = lambda: int(sys.stdin.readline())
rm = lambda: map(int, sys.stdin.readline().split())
rl = lambda: list(map(int, sys.stdin.readline().split()))
inf = float('inf')
mod = 10**9 + 7

n = ri()
cnt = 0
for v in collections.Counter([ri() for _ in range(n)]).values():
    if v&1:
        cnt += 1
print(cnt)
Buggy code:
import sys

n = int(input())
a = map(int, sys.stdin.read().split("\n"))

d = dict()
for a_i in a:
	if a_i not in d:
		d[a_i] = 0
	d[a_i] = (d[a_i]+1) % 2

print(sum(d.values))

Fixed code:
import sys

n = int(input())
# a = map(int, sys.stdin.read().split("\n"))
a = map(int, [input() for i in range(n)])

d = dict()
for a_i in a:
	if a_i not in d:
		d[a_i] = 0
	d[a_i] = (d[a_i]+1) % 2

print(sum(d.values()))
Buggy code:
n = int(input())
C = {}
for _ in range(n):
    a = input()
    if a not in C:
        C[a] = 0
    C[a] += 1
print(C)
for i in C.keys():
    C[i] %= 2
print(sum(C.values()))

Fixed code:
n = int(input())
C = {}
for _ in range(n):
    a = input()
    if a not in C:
        C[a] = 0
    C[a] += 1
for i in C.keys():
    C[i] %= 2
print(sum(C.values()))
Buggy code:
n = int(input())
a = []
for i in range(n):
  a.append(int(input()))
a.sort()
b = []
for i in range(0,n-1,2):
  if a[i] != a[i+1]:
    b.append(a[i])
    b.append(a[i+1])
  else:
    continue
if n%2 == 1:
  b.append(a[-1])
print(b)
ans = []
if b != []:
  ans.append(b[0])
  for j in range(1,len(b)-1,2):
    if b[j] != b[j+1]:
      ans.append(b[i])
      ans.append(b[i+1])
print(ans)
if ans == []:
  print(0)
else:
  print(len(ans))

Fixed code:
n = int(input())
a = []
for i in range(n):
  a.append(int(input()))
a.sort()
b = []
for i in range(0,n-1,2):
  if a[i] != a[i+1]:
    b.append(a[i])
    b.append(a[i+1])
  else:
    continue
if n%2 == 1:
  b.append(a[-1])
#print(b)
ans = []
if b != []:
  ans.append(b[0])
  for j in range(1,len(b)-1,2):
    if b[j] != b[j+1]:
      ans.append(b[j])
      ans.append(b[j+1])
  if len(b)%2 == 0:
    ans.append(b[-1])
#print(ans)
if ans == []:
  print(0)
else:
  print(len(ans))
Buggy code:
N = int(input())
A = list(int(input()) for _ in range(N))
A.sort()
print(A)
count = 0
test = -1
stack = 0
for i in range(N):
    if test != A[i]:
        count += 1
        stack = 1
        test = A[i]
    else:
        if stack == 1:
            count = count - 1
            stack = 0
        else:
            stack = 1
            count += 1
print(count)


Fixed code:
N = int(input())
A = list(int(input()) for _ in range(N))
A.sort()
count = 0
test = -1
stack = 0
for i in range(N):
    if test != A[i]:
        count += 1
        stack = 1
        test = A[i]
    else:
        if stack == 1:
            count = count - 1
            stack = 0
        else:
            stack = 1
            count += 1
print(count)
Buggy code:
n=int(input())
a= [int(input()) for i in range(n)] 

a.sort()
ans=0
m=1
print(a)
for i in range(1,n):
    if a[i-1] == a[i]:
        m+=1
    else:
        ans+=(m%2)
        m=1

ans+=(m%2)

print(ans)


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

a.sort()
ans=0
m=1

for i in range(1,n):
    if a[i-1] == a[i]:
        m+=1
    else:
        ans+=(m%2)
        m=1

ans+=(m%2)

print(ans)
Buggy code:
import collections
n=int(input())
a=[]
for _ in range(n)
    a.append(int(input()))
c = collections.Counter(a)
ans=0
for k,v in c.items():
    if v % 2 != 0:
        ans += 1
print(ans)

Fixed code:
import collections
n=int(input())
a=[int(input()) for _ in range(n)]
c = collections.Counter(a)
ans=0
for k,v in c.items():
    if v % 2 != 0:
        ans += 1
print(ans)
Buggy code:
import collections

n = int(input())

co = collectiosn.Counter([int(input()) for i in range(n)])

c =0

for i in co.values():
    if i % 2 != 0:
        c  +=1
print(c)

Fixed code:
import collections

n = int(input())

co = collections.Counter([int(input()) for i in range(n)])

c =0

for i in co.values():
    if i % 2 != 0:
        c  +=1
print(c)
Buggy code:


import numpy as np

n=int(input())
a=np.array([int(input()) for i in range(n)])
a=np.sort(a)
ans=0
for i in range(n):
    c=0
    while(i<=n-2 and a[i]==a[i+1]):
        i+=1
        c+=1
    if(c%2==1):ans+=1
print(ans)


Fixed code:


import numpy as np

n=int(input())
a=np.array([int(input()) for i in range(n)])
a=np.sort(a)
ans=0
i=0
while(i<=n-1):
    c=1
    while(i<=n-2 and a[i]==a[i+1]):
        i+=1
        c+=1
    if(c%2==1):ans+=1
    #print(a[i],c)
    i+=1
print(ans)
Buggy code:
import collections

N = int(input())

List = {}
for i in range(N):
    A = int(input())
    if List.get(A,None)==None:
        List[A]=1
    else:
        List[A]=0

c = collections.Counter(List)

print(len(c.most_common(1)))


Fixed code:
import collections

N = int(input())

List = {}
for i in range(N):
    A = int(input())
    if List.get(A,None)==None:
        List[A]=1
    else:
        del List[A]

c = collections.Counter(List)

print(len(c))
Buggy code:
d=set()
for i in[0]*int(input()):d^={input()}
print(len(p))

Fixed code:
d=set()
for i in[0]*int(input()):d^={input()}
print(len(d))
Buggy code:
N=int(input())
a=[]
for i in range(N):
    a.append(int(input()))

chk={}

for sa in a:
    if sa in chk:
        if chk[sa]==1:
            chk[sa]=0
        else:
            chk[sa]=1
    else:
        chk[sa]=1


print(chk)
print(sum(chk.values()))


Fixed code:


N=int(input())
a=[]
for i in range(N):
    a.append(int(input()))

chk={}

for sa in a:
    if sa in chk:
        if chk[sa]==1:
            chk[sa]=0
        else:
            chk[sa]=1
    else:
        chk[sa]=1


print(sum(chk.values()))
Buggy code:
N=int(input())
p=[]
count=0
for i in range (N):
  a=int(input())
  p.append(a)
list.sort(p)
flag=1
for j in range (N-1):
  if p[j]==p[j+1]:
    flag*=-1
  else:
    if flag>0:
      count+=1
    else:
      count-=1
    flag=1
print(count)

Fixed code:
N=int(input())
p=[]
count=0
for i in range (N):
  a=int(input())
  p.append(a)
list.sort(p)
flag=1
for j in range (N-1):
  if p[j]==p[j+1]:
    flag*=-1
  else:
    if flag>0:
      count+=1
    flag=1
if flag>0:
  count+=1
print(count)
Buggy code:
n = int (input())
ln = []
ln2 = []
for _ in range(n):
    ln.append( int (input()))

C = collections.Counter(ln)
 
ans = 0
for v in C.items():
    if (v%2 != 0):
        ans += 1

print(ans)

Fixed code:
import collections
n = int (input())
ln = []
ln2 = []
for _ in range(n):
    ln.append( int (input()))

C = collections.Counter(ln)
 
ans = 0
for k, v in C.items():
    if (v%2 != 0):
        ans += 1

print(ans)
Buggy code:
from collections import Counter

def main():
  n = int(input())
  ans = 0
  A = Counter((int(input()) for _ in range(n)))
  for i in A.values():
    if i%2 != 0:
      ans += 1
  return ans

if __name__=='__main__':
  main()

Fixed code:
from collections import Counter

def main():
  n = int(input())
  ans = 0
  A = Counter((int(input()) for _ in range(n)))
  for i in A.values():
    if i%2 != 0:
      ans += 1
  print(ans)

if __name__=='__main__':
  main()
Buggy code:
import sys
input = sys.stdin.readline

import bisect

def main():
    n = int(input())
    s = []

    for i in range(n):
        a = int(input())
        i = bisect.bisect_left(s, a)
        if len(s) > 0 and s[i] == a:
            s.remove(a)
        else:
            s.insert(i, a)


    print(len(s))


main()

Fixed code:
import sys
input = sys.stdin.readline

import bisect

def main():
    n = int(input())
    s = []

    for i in range(n):
        a = int(input())
        i = bisect.bisect_left(s, a)
        if len(s) > i and s[i] == a:
            s.remove(a)
        else:
            s.insert(i, a)


    print(len(s))


main()
Buggy code:
import Counter
n=int(input())
a=[int(input()) for i in range(n)]
c=Counter(a).most_common()
ans=0
for v in c:
  if v[1]%2==1:
    ans+=1
print(ans)

Fixed code:
from collections import Counter
n=int(input())
a=[int(input()) for i in range(n)]
c=Counter(a).most_common()
ans=0
for v in c:
  if v[1]%2==1:
    ans+=1
print(ans)
Buggy code:
N = int(input())
A = []
for _ in range(N):
    A.append(int(input()))
A.sort()
ans = 0
idx = 0
while idx < N:
    sub = 0
    while idx + sub < N and A[idx] == A[idx + sub]:
        sub = sub + 1
    if sub % 2 == 1:
        ans = ans + 1
print(ans)

Fixed code:
N = int(input())
A = []
for _ in range(N):
    A.append(int(input()))
A.sort()
ans = 0
idx = 0
while idx < N:
    sub = 0
    while idx + sub < N and A[idx] == A[idx + sub]:
        sub = sub + 1
    if sub % 2 == 1:
        ans = ans + 1
    idx = idx + sub
print(ans)
Buggy code:
n = int(input())
di = {}

for x in range(n):
  i = int(input())
  if (i in di.keys()):
    di.pop()
  else:
    di[i] = i
print(len(di))

Fixed code:
n = int(input())
di = {}

for x in range(n):
  i = int(input())
  if (i in di.keys()):
    di.pop(i)
  else:
    di[i] = i
print(len(di))
Buggy code:
s = set()
n = int(input())
for _ in range(n):
  x = int(input())
  if x in s:
    s.remove(x)
  else:
    s.add(x)
    
print(len(x))

Fixed code:
s = set()
n = int(input())
for _ in range(n):
    x = int(input())
    if x in s:
        s.remove(x)
    else:
        s.add(x)

print(len(s))
Buggy code:
n=int(input())
a=[]
for i in range(n):
    a.append(int(input()))
a2=sorted(a)
num=a2[0]
count=1
ans=0
for i in range(1,n):
    if a2[i]==num:
        count+=1
    else:
        if count%2==1:
            ans+=num
        num=a2[i]
        count=1
if count%2==1:
        ans+=num
print(ans)

Fixed code:
n=int(input())
a=[]
for i in range(n):
    a.append(int(input()))
a2=sorted(a)
num=a2[0]
count=1
ans=0
for i in range(1,n):
    if a2[i]==num:
        count+=1
    else:
        if count%2==1:
            ans+=1
        num=a2[i]
        count=1
if count%2==1:
        ans+=1
print(ans)