题解 100% AC

#include<bits/stdc++.h>
using namespace std;
int a,b,c,d;
int main() {
    int n;
    cin>>n;
    for(int i=1;i<=n;i++) {
        int x;
        cin>>x;
        if(x<=18)a++;
        else if(x<=35)b++;
        else if(x<=60)c++;
        else d++;
    }
    cout<<fixed<<setprecision(2)<<100.0*a/n<<"%"<<endl;
    cout<<fixed<<setprecision(2)<<100.0*b/n<<"%"<<endl;
    cout<<fixed<<setprecision(2)<<100.0*c/n<<"%"<<endl;
    cout<<fixed<<setprecision(2)<<100.0*d/n<<"%"<<endl;
    return 0;
}