CODE

class Solution:
    def maxArea(self, height: List[int]) -> int:
        l, r = 0, len(height) - 1
        res = 0

        while l < r:
            # Area is function of breath (r - l) and height. 
            # The min of left and right wall determines the max
            # height of the container
            res = max(res, min(height[l], height[r]) * (r - l))
            if height[l] < height[r]:
                l += 1
            else:
                r -= 1
        return res