题解

#include<bits/stdc++.h>
using namespace std;
int n,a[101];
double a1,a2,a3,a4;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    for(int i=1;i<=n;i++){
        if(a[i]<=18)a1++;
        else if(a[i]<=35)a2++;
        else if(a[i]<=60)a3++;
        else a4++;
    }
    printf("%.2lf",a1/n*100);
    cout<<"%\n";
    printf("%.2lf",a2/n*100);
    cout<<"%\n";
    printf("%.2lf",a3/n*100);
    cout<<"%\n";
    printf("%.2lf",a4/n*100);
    cout<<"%\n";
    return 0;
}