Buggy python submission (verdict: Runtime Error):
import numpy as np
N, M = map(int, input().split())

H = np.array(list(map(int, input().split())))

streetMatrix = np.array([np.zeros(N, dtype='int8')]*N)

for m in range(M):
    A, B = map(int, input().split())
    
    streetMatrix[A-1][B-1] = 1
    streetMatrix[B-1][A-1] = 1

countGood = 0
street_and_height = streetMatrix*H

for i in range(N):
    if max(streetMatrix[i]) == 0:
        countGood += 1
    elif H[i] > max(street_and_height[i]):
        countGood += 1
print(countGood)

Fixed submission:
N, M = map(int, input().split())
H = list(map(int, input().split()))

competitor_H = {}

for m in range(M):
    A, B = map(int, input().split())
    
    if A-1 not in competitor_H.keys():
        competitor_H[A-1] = []
    competitor_H[A-1].append(H[B-1])
    
    if B-1 not in competitor_H.keys():
        competitor_H[B-1] = []
    competitor_H[B-1].append(H[A-1])

countGood = 0
for i in range(N):
    if i not in competitor_H.keys():
        countGood += 1
    elif H[i] > max(competitor_H[i]):
        countGood += 1
print(countGood)

Buggy python submission (verdict: Runtime Error):
import numpy as np
N, M = map(int, input().split())

H = np.array(list(map(int, input().split())))

streetMatrix = np.array([np.zeros(N, dtype='int8')]*N)

for m in range(M):
    A, B = map(int, input().split())
    
    streetMatrix[A-1][B-1] = 1
    streetMatrix[B-1][A-1] = 1

countGood = 0
street_and_height = streetMatrix*H

for i in range(N):
    if max(streetMatrix[i]) == 0:
        countGood += 1
    elif H[i] > max(street_and_height[i]):
        countGood += 1
print(countGood)

Fixed submission:
N, M = map(int, input().split())
H = list(map(int, input().split()))

competitor_H = {}

for m in range(M):
    A, B = map(int, input().split())
    
    if A-1 not in competitor_H.keys():
        competitor_H[A-1] = []
    competitor_H[A-1].append(H[B-1])
    
    if B-1 not in competitor_H.keys():
        competitor_H[B-1] = []
    competitor_H[B-1].append(H[A-1])

countGood = 0
for i in range(N):
    if i not in competitor_H.keys():
        countGood += 1
    elif H[i] > max(competitor_H[i]):
        countGood += 1
print(countGood)

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
H = list(map(int, input().split()))

streetMatrix = [[0]*N for i in range(N)]

for m in range(M):
    A, B = map(int, input().split())
    
    streetMatrix[A-1][B-1] = 1
    streetMatrix[B-1][A-1] = 1

countGood = 0

for i in range(N):
    if max(streetMatrix[i]) == 0:
        countGood += 1
    elif H[i] > max([x*y for x,y in zip(streetMatrix[i],H)]):
        countGood += 1
print(countGood)

Fixed submission:
N, M = map(int, input().split())
H = list(map(int, input().split()))

competitor_H = {}

for m in range(M):
    A, B = map(int, input().split())
    
    if A-1 not in competitor_H.keys():
        competitor_H[A-1] = []
    competitor_H[A-1].append(H[B-1])
    
    if B-1 not in competitor_H.keys():
        competitor_H[B-1] = []
    competitor_H[B-1].append(H[A-1])

countGood = 0
for i in range(N):
    if i not in competitor_H.keys():
        countGood += 1
    elif H[i] > max(competitor_H[i]):
        countGood += 1
print(countGood)

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
H = list(map(int, input().split()))

streetMatrix = [[0]*N for i in range(N)]

for m in range(M):
    A, B = map(int, input().split())
    
    streetMatrix[A-1][B-1] = 1
    streetMatrix[B-1][A-1] = 1

countGood = 0

for i in range(N):
    if max(streetMatrix[i]) == 0:
        countGood += 1
    elif H[i] > max([x*y for x,y in zip(streetMatrix[i],H)]):
        countGood += 1
print(countGood)

Fixed submission:
N, M = map(int, input().split())
H = list(map(int, input().split()))

competitor_H = {}

for m in range(M):
    A, B = map(int, input().split())
    
    if A-1 not in competitor_H.keys():
        competitor_H[A-1] = []
    competitor_H[A-1].append(H[B-1])
    
    if B-1 not in competitor_H.keys():
        competitor_H[B-1] = []
    competitor_H[B-1].append(H[A-1])

countGood = 0
for i in range(N):
    if i not in competitor_H.keys():
        countGood += 1
    elif H[i] > max(competitor_H[i]):
        countGood += 1
print(countGood)

Buggy python submission (verdict: Runtime Error):
import numpy as np

N, M = map(int, input().split())
H = np.array(list(map(int, input().split())))

streetMatrix = np.array([np.zeros(N)]*N)

for m in range(M):
    A, B = map(int, input().split())
    
    streetMatrix[A-1][B-1] = 1
    streetMatrix[B-1][A-1] = 1

countGood = 0

for i in range(N):
    if max(streetMatrix[i]) == 0:
        countGood += 1
    elif H[i] > max(streetMatrix[i] * H):
        countGood += 1
print(countGood)

Fixed submission:
N, M = map(int, input().split())
H = list(map(int, input().split()))

competitor_H = {}

for m in range(M):
    A, B = map(int, input().split())
    
    if A-1 not in competitor_H.keys():
        competitor_H[A-1] = []
    competitor_H[A-1].append(H[B-1])
    
    if B-1 not in competitor_H.keys():
        competitor_H[B-1] = []
    competitor_H[B-1].append(H[A-1])

countGood = 0
for i in range(N):
    if i not in competitor_H.keys():
        countGood += 1
    elif H[i] > max(competitor_H[i]):
        countGood += 1
print(countGood)