Buggy python submission (verdict: Runtime Error):
from itertools import combinations, count
 
n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)
r = next(i for i in count(n, -1) for x in map(set, combinations(r, i))
         if set.union(*(a[j][0] for j in x)).isdisjoint(x) and
         set.union(*(a[j][1] for j in x)) <= x)
print(r)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)

Buggy python submission (verdict: Runtime Error):
from itertools import combinations, count
 
n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)
r = next(i for i in count(n, - 1) for x in map(set, combinations(r, i))
         if all(a[j][0].isdisjoint(x) and a[j][1] < x for j in x))
print(r)
from itertools import combinations, count

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)
r = next(i for i in count(n, - 1) for x in map(set, combinations(r, i))
         if all(a[j][0].isdisjoint(x) and a[j][1] < x for j in x))
print(r)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)

Buggy python submission (verdict: Runtime Error):
def popcount(x):
  r, q = 0, x
  while x:
    r += 1
    x &= x - 1
  return r, q
 
n = int(input())
r = range(n)
a = [[0, 0] for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y] |= 1 << (x - 1)
l = (1 << n) - 1 
b = sorted(map(popcount, range(1, l + 1)))
ans = next((i for i, x in reversed(b)
           if all(a[j][0] & x == a[j][1] & l - x == 0 for j in r if x >> j & 1), 0) 
print(ans)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)

Buggy python submission (verdict: Runtime Error):
def popcount(x):
  r, q = 0, x
  while x:
    r += 1
    x &= x - 1
  return r, q
 
n = int(input())
r = range(n)
a = [[0, 0] for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y] |= 1 << (x - 1)
l = (1 << n) - 1 
b = sorted(map(popcount, range(1, l + 1)))
ans = next(i for i, x in reversed(b)
           if all(a[j][0] & x == a[j][1] & l - x == 0 for j in r if x >> j & 1)) 
print(ans)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)

Buggy python submission (verdict: Runtime Error):
from itertools import combinations
 
n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)
 
fail = lambda x: not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x)
 
while all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x)

while all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)

Buggy python submission (verdict: Runtime Error):
from itertools import combinations

n = int(input())
r = range(n)
a = [([], []) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].append(x - 1)

fail = lambda x: not all(x.isdisjoint(a[i][0] and x.issuperset(a[i][1])) for i in x)

while all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)


Fixed submission:
from itertools import combinations

n = int(input())
r = range(n)
a = [(set(), set()) for _ in r]
for i in r:
  for _ in range(int(input())):
    x, y = map(int, input().split())
    a[i][y].add(x - 1)

fail = lambda x: (not all(a[i][0].isdisjoint(x) and a[i][1] < x for i in x))

while n and all(map(fail, map(set, combinations(r, n)))):
  n -= 1
print(n)