Buggy python submission (verdict: Runtime Error):

n = int(input())
people = {}

for i in range(n):
    sentenses = int(input())
    if sentenses > 0:
        for j in range(sentenses):
            v = list(map(int, input().split()))
            if i in people.keys():
                people[i].append(v)
            else:
                people[i] = [v]
            
ans = 0

for i in range(2**n):
    speaker = []
    p_list = [0] * n
    for j in range(n):
        if ((i >> j) % 2) == 1:
            speaker.append(j)
            p_list[j] = 1

    continue_flag = True
    for s in speaker:
        if continue_flag:
            sentenses = people[s]
            for sent in sentenses:
                if p_list[sent[0]-1] == sent[1]:
                    p_list[sent[0]-1] = sent[1]
                else:
                    continue_flag = False
                    break
        else:
            break
        
    if continue_flag:
        temp_ans = len(speaker)
        ans = max(temp_ans, ans)

print(ans)


Fixed submission:

n = int(input())
people = {}

for i in range(n):
    sentenses = int(input())
    if sentenses > 0:
        for j in range(sentenses):
            v = list(map(int, input().split()))
            if i in people.keys():
                people[i].append(v)
            else:
                people[i] = [v]
            
ans = 0

for i in range(2**n):
    speaker = []
    p_list = [0] * n
    for j in range(n):
        if ((i >> j) % 2) == 1:
            speaker.append(j)
            p_list[j] = 1

    continue_flag = True
    for s in speaker:
        if continue_flag:
            if s in people.keys():
                sentenses = people[s]
            else:
                continue
            for sent in sentenses:
                if p_list[sent[0]-1] == sent[1]:
                    p_list[sent[0]-1] = sent[1]
                else:
                    continue_flag = False
                    break
        else:
            break
        
    if continue_flag:
        temp_ans = len(speaker)
        ans = max(temp_ans, ans)

print(ans)

Buggy python submission (verdict: Runtime Error):
n = int(input())
people = {}

for i in range(n):
    sentenses = int(input())
    for j in range(sentenses):
        v = list(map(int, input().split()))
        if i in people.keys():
            people[i].append(v)
        else:
            people[i] = [v]
            
ans = 0

for i in range(2**n):
    speaker = []
    p_list = [0] * n
    for j in range(n):
        if ((i >> j) % 2) == 1:
            speaker.append(j)
            p_list[j] = 1

    continue_flag = True
    for s in speaker:
        if continue_flag:
            sentenses = people[s]
            for sent in sentenses:
                if p_list[sent[0]-1] == sent[1]:
                    p_list[sent[0]-1] = sent[1]
                else:
                    continue_flag = False
                    break
        else:
            break
        
    if continue_flag:
        temp_ans = len(speaker)
        ans = max(temp_ans, ans)

print(ans)
            

Fixed submission:

n = int(input())
people = {}

for i in range(n):
    sentenses = int(input())
    if sentenses > 0:
        for j in range(sentenses):
            v = list(map(int, input().split()))
            if i in people.keys():
                people[i].append(v)
            else:
                people[i] = [v]
            
ans = 0

for i in range(2**n):
    speaker = []
    p_list = [0] * n
    for j in range(n):
        if ((i >> j) % 2) == 1:
            speaker.append(j)
            p_list[j] = 1

    continue_flag = True
    for s in speaker:
        if continue_flag:
            if s in people.keys():
                sentenses = people[s]
            else:
                continue
            for sent in sentenses:
                if p_list[sent[0]-1] == sent[1]:
                    p_list[sent[0]-1] = sent[1]
                else:
                    continue_flag = False
                    break
        else:
            break
        
    if continue_flag:
        temp_ans = len(speaker)
        ans = max(temp_ans, ans)

print(ans)