Błędna odpowiedź. Python 3.7
n = int(input())
pos1, spd1 = map(int, input().split())
rows = 1
for i in range(n-1):
pos2, spd2 = map(int, input().split())
if spd2 > spd1:
pos1 = pos2
elif spd2 == spd1:
if pos1+1 == pos2:
pos1 = pos2
else:
rows += 1
pos1 = pos2
spd1 = spd2
elif spd2 < spd1:
rows += 1
pos1 = pos2
spd1 = spd2
print(rows)
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