Apply Discount Every n Orders(C++每隔 n 个顾客打折)

解题思路:

(1)使用map记录商品的id和价格

class Cashier {
private:
    int count=0,a,b;
    double sum=0; 
    unordered_map mp;
public:
    Cashier(int n, int discount, vector& products, vector& prices) {
        a=n;
        b=discount;
        for(int i=0;i product, vector amount) {
        sum=0;
        count++;
        for(int i=0;igetBill(product,amount);
 */

 

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