Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline

# 自分の解答
def myAnswer(N:int,dic:dict) -> int: # pythonはlist操作が重いので辞書で処理する
   ans = 0
   for a in dic.values():
      if(a % 2 == 1):
         ans += 1
   return ans
def modelAnswer(N:int,A:list) -> int:
   ans = []
   A.sort()
   for a in A:
      if(a in ans):
         ans.remove(a)
      else:
         ans.append(a)
   return len(ans)

def main():
   N = int(input())
   dic = {}
   A =[]
   for _ in range(N):
      a = int(input())
      A.append(a)
      if(a in dic.keys()):
         dic[a]+=1
      else:
         dic[a]=1
   print(modelAnswer(N,A))
if __name__ == '__main__':
   main()


Fixed submission:
import sys
input = sys.stdin.readline
N=int(input())
ans=dict()
cnt=0

for _ in range(N):
    A=int(input())
    if((A in ans)==False):
        ans[A]=1
    else:
        ans[A]+=1

for value in ans.values():
    if(value%2==1):
        cnt+=1

print(cnt)

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

# 自分の解答
def myAnswer(N:int,dic:dict) -> int: # pythonはlist操作が重いので辞書で処理する
   ans = 0
   for a in dic.values():
      if(a % 2 == 1):
         ans += 1
   return ans
def modelAnswer(N:int,A:list) -> int:
   ans = []
   A.sort()
   for a in A:
      if(a in ans):
         ans.remove(a)
      else:
         ans.append(a)
   return len(ans)

def main():
   N = int(input())
   dic = {}
   for _ in range(N):
      a = int(input())
      if(a in dic.keys()):
         dic[a]+=1
      else:
         dic[a]=1
   print(modelAnswer(N,dic))
if __name__ ==

Fixed submission:
import sys
input = sys.stdin.readline
N=int(input())
ans=dict()
cnt=0

for _ in range(N):
    A=int(input())
    if((A in ans)==False):
        ans[A]=1
    else:
        ans[A]+=1

for value in ans.values():
    if(value%2==1):
        cnt+=1

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
def myAnswer(N:int,A:list) -> int:
   ans = []
   for a in A:
      if(a in ans):
         ans.remove(a)
      else:
         ans.append(a)
   return len(ans)

def modelAnswer():
   return
def main():
   N = int(input())
   A = [int(input()) for _ in range(N)]
   print(myAnswer(N,A[:]))
if __name__ == '__main__':
   main()

Fixed submission:
import sys
input = sys.stdin.readline
N=int(input())
ans=dict()
cnt=0

for _ in range(N):
    A=int(input())
    if((A in ans)==False):
        ans[A]=1
    else:
        ans[A]+=1

for value in ans.values():
    if(value%2==1):
        cnt+=1

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline
N=int(input())
ans=[]

for _ in range(N):
    A=int(input())
    if((A in ans) == True):
        ans.remove(A)
    else:
        ans.append(A)


print(len(ans))


Fixed submission:
import sys
input = sys.stdin.readline
N=int(input())
ans=dict()
cnt=0

for _ in range(N):
    A=int(input())
    if((A in ans)==False):
        ans[A]=1
    else:
        ans[A]+=1

for value in ans.values():
    if(value%2==1):
        cnt+=1

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
N=int(input())

ans=[]

for _ in range(N):
    A=int(input())
    if((A in ans) == True):
        ans.remove(A)
    else:
        ans.append(A)


print(len(ans))


Fixed submission:
import sys
input = sys.stdin.readline
N=int(input())
ans=dict()
cnt=0

for _ in range(N):
    A=int(input())
    if((A in ans)==False):
        ans[A]=1
    else:
        ans[A]+=1

for value in ans.values():
    if(value%2==1):
        cnt+=1

print(cnt)