程序代码：

#include "stdafx.h"
#include <iostream>
using namespace std;

class Yuebao
{
    static double profitRate;//声明利息
    double yue;//余额

public:
    static void setProfitRate(double rate);
    /* Your code here! */
    Yuebao(double a):yue(a){}//构造函数
    void addProfit() {    
         yue+=yue*profitRate;
    }
    void deposit(double amountin) {
        yue += amountin;
    }
    void withdraw(double amountout) {
        yue-=amountout;
    }
    double getBalance() {
        return yue;
    }
};

void Yuebao::setProfitRate(double rate) { //定义余额
        profitRate = rate;
}
int main()
{
    int n;
    while (cin >> n)
    {
        double profitRate;
        cin >> profitRate;
        Yuebao::setProfitRate(profitRate);//设定鱼额宝的利率
        Yuebao y(0); //新建鱼额宝账户，余额初始化为0
        int operation;//接受输入判断是存还是取
        double amount;//接受输入存取金额
        for (int i = 0; i < n; ++i)
        {
            y.addProfit();//加入前一天余额产生的利息
            cin >> operation >> amount;
            if (operation == 0)
                y.deposit(amount);//存入金额
            else
                y.withdraw(amount);//取出金额
        }
        cout << y.getBalance() << endl;//输出最终账户余额
    }
    return 0;
}