esay~~~

本题

#include<iostream>
using namespace std;
int main(){
    int n,a,a1=0,a2=0,a3=0,a4=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a;
        if(a<=18)a1++;
        else if(a<=35)a2++;
        else if(a<=60)a3++;
        else a4++;
    }
    printf("%.2f",100.0*a1/n);
    cout<<"%\n";
    printf("%.2f",100.0*a2/n);
    cout<<"%\n";
    printf("%.2f",100.0*a3/n);
    cout<<"%\n";
    printf("%.2f",100.0*a4/n);
    cout<<"%\n";
}