class Solution:
    def increasingTriplet(self, nums: List[int]) -> bool:
        n1 = n2 = float('inf')

        for n in nums:
            if n < n1:
                n1 = n
            elif n1 < n < n2:
                n2 = n
            elif n1 < n2 < n:
                return True
        return False