这么简单ac率0%？沙发

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;cin>>a>>b;
    a-=b/2;
    double c=0;
    c+=a*3.8+b*8.9;
    if(c>=30){
        c=30+(c-30)*0.85;
    }
    printf("%.1lf",c);
    return 0;
}