Easiest python solution
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution:\n    def lemonadeChange(self, bills: List[int]) -> bool:\n        a,b=0,0\n        for i in range(len(bills)):\n            if bills[i]==5:\n                a+=1\n            elif bills[i]==10:\n                b+=1\n                if not a:\n                    return False\n                a-=1\n            else:\n                if a and b:\n                    a-=1\n                    b-=1\n                elif a>2:\n                    a-=3\n                else:\n                    return False\n        return True\n```
['Python3']