题解

代码如下

#include "iostream"
using namespace std;
int main(int argc, char **argv){
    double a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,b = 0.2,c = 0;
    cin>>a1>>a2>>a3>>a4>>a5>>a6>>a7>>a8>>a9>>a10>>a11>>a12;
    if(a1>800){
        (a1-=800)*=b;
        c+=a1;
    }
    if(a2>800){
        (a2-=800)*=b;
        c+=a2;
    }
    if(a3>800){
        (a3-=800)*=b;
        c+=a3;
    }
    if(a4>800){
        (a4-=800)*=b;
        c+=a4;
    }
    if(a5>800){
        (a5-=800)*=b;
        c+=a5;
    }
    if(a6>800){
        (a6-=800)*=b;
        c+=a6;
    }
    if(a7>800){
        (a7-=800)*=b;
        c+=a7;
    }
    if(a8>800){
        (a8-=800)*=b;
        c+=a8;
    }
    if(a9>800){
        (a9-=800)*=b;
        c+=a9;
    }
    if(a10>800){
        (a10-=800)*=b;
        c+=a10;
    }
    if(a11>800){
        (a11-=800)*=b;
        c+=a11;
    }
    if(a12>800){
        (a12-=800)*=b;
        c+=a12;
    }
    printf("%0.2f\n",c);
    return 0;
}