Watering Plants II

Let’s solve the problem by simulating the process of Alice and Bob watering the plants. We’ll iterate over the plants and keep track of the water left in both Alice’s and Bob’s watering cans.

Here’s the code:

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class Solution:
    def minimumRefill(self, plants: List[int], capacityA: int, capacityB: int) -> int:
        refills = 0
        waterA, waterB = capacityA, capacityB
        left, right = 0, len(plants) - 1

        # Iterate while left is less than or equal to right
        while left <= right:
            # If both Alice and Bob reach the same plant, compare their water level
            if left == right:
                if waterA < plants[left] and waterB < plants[left]:
                    refills += 1
                break

            # If Alice does not have enough water for the current plant, refill her can
            if waterA < plants[left]:
                waterA = capacityA
                refills += 1

            # If Bob does not have enough water for the current plant, refill his can
            if waterB < plants[right]:
                waterB = capacityB
                refills += 1

            # Water the plants and update the remaining water
            waterA -= plants[left]
            waterB -= plants[right]

            # Move Alice and Bob to the next plants
            left += 1
            right -= 1

        return refills

Here, we check if Alice and Bob have enough water to water the current plants. If not, they refill their cans, and we increment the count of refills. Then, we update their remaining water and move to the next plants.

The code returns the total number of times Alice and Bob have to refill their watering cans to water all the plants.