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柠檬水找零⚓︎

Leetcode题目链接

描述⚓︎

详见中文题目链接。

解答⚓︎

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class Solution {
public:
    bool lemonadeChange(vector<int>& bills) {
        int five = 0, ten = 0;
        for (int bill : bills) {
            if (bill == 5) five++;
            else if (bill == 10) {
                if (five == 0) return false;
                five--, ten++;
            } else {  // bill == 20
                if (five > 0 && ten > 0) {
                    five--, ten--;
                } else if (five >= 3) {
                    five -= 3;
                } else return false;
            }
        }
        return true;
    }
};