Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
Result = []
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.append(number)
print(len(Result))

Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
Result = []
for i in range(N):
    number = int(input())
    if not number in Result:
        Result.append(number)
    else:
        Result.remove(number)
print(len(Result))

Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if not number in list:
        list.append(number)
    else:
        list.remove(number)
print(len(list))

Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if number in list:
        list.remove(number)
    else:
        list.append(number)
print(len(list))


Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Runtime Error):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if  number in list:
        list.append(number)
    else:
        list.remove(number)
print(len(list))

Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if number in list:
        list.remove(number)
        #print(list)
    else:
        list.append(number)
        #print(list)
print(len(list))


Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if number in list:
        list.remove(number)
        #print(list)
    else:
        list.append(number)
        #print(list)
print(len(list))


Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
list = []
for i in range(N):
    number = int(input())
    if number in list:
        list.remove(number)
        #print(list)
    else:
        list.append(number)
        #print(list)
print(len(list))


Fixed submission:
N = int(input())
Result = set()
for i in range(N):
    number = int(input())
    if  number in Result:
        Result.remove(number)
    else:
        Result.add(number)
print(len(Result))