class Solution:
def increasingTriplet(self, nums: List[int]) -> bool:
first, second, third = None, None, None
for num in nums:
if first is None:
first = num
else:
first = min(num, first)
if first is not None and num > first:
if second is None:
second = num
else:
second = min(second, num)
if second is not None and num > second:
return True
return False