# https://leetcode.com/problems/lemonade-change
from typing import List

class Solution:
    def lemonadeChange(self, bills: List[int]) -> bool:
        inventory: List[int] = [0, 0]
        for bill in bills:
            match bill:
                case 5:
                    inventory[0] += 1
                case 10:
                    inventory[0] -= 1
                    inventory[1] += 1
                    if inventory[0] < 0:
                        return False
                case 20:
                    if inventory[1] == 0:
                        inventory[0] -= 3
                    else:
                        inventory[1] -= 1
                        inventory[0] -= 1
                    if inventory[0] < 0 or inventory[1] < 0:
                        return False
        return True