c++趣味编程

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int x1,x2,x3,x4,x5;
    int a,b,c,d,e;
    double max=0.0,x;
    for(x5=0;x5<=2;x5++)
    {
        for(x4=0;x4<=(20-x5*8)/5;x4++)
        {
            for(x3=0;x3<=(20-x5*8-x4*5)/3;x3++)
            {
                for(x2=0;x2<=(20-x5*8-x4*5-x3*3)/2;x2++)
                {
                    x1=20-8*x5-x4*5-x3*3-x2*2; 
                    x=2000.0*pow((1+0.0063*12),x1)
                    *pow((1+0.0066*2*12),x2)
                    *pow((1+0.0069*3*12),x3)
                    *pow((1+0.0075*5*12),x4)
                    *pow((1+0.0084*8*12),x5);
                    if(x>max)
                    {
                        max=x;
                        a=x1;
                        b=x2;
                        c=x3;
                        d=x4;
                        e=x5;
                    }
                }
            }
        }
    }
    cout<<max<<endl;
    cout<<"存一年几次："<<a<<endl;
    cout<<"存二年几次："<<b<<endl;
    cout<<"存三年几次："<<c<<endl;
    cout<<"存五年几次："<<d<<endl;
    cout<<"存八年几次："<<e<<endl;
    
}