Leetcode 890 Solution

This article provides solution to leetcode question 890 (lemonade-change)
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https://leetcode.com/problems/lemonade-change

Solution

class Solution:
    def lemonadeChange(self, bills: List[int]) -> bool:
        fives = 0
        tens = 0

        for bill in bills:
            if bill == 10:
                if fives == 0:
                    return False
                fives -= 1
                tens += 1
            elif bill == 20:
                if tens >= 1 and fives >= 1:
                    tens -= 1
                    fives -= 1
                elif fives >= 3:
                    fives -= 3
                else:
                    return False
            else:
                fives += 1

        return True