格式化得使用%%,20%要0.2*100

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int c1=0,c2=0,c3=0,c4=0,x;
    for(int i=0;i<n;i++){
        cin>>x;
        if(0<=x && x<=18) c1++;
        else if(19<=x && x<=35) c2++;
        else if(36<=x && x<=60) c3++;
        else c4++;
    }
    double p1=double(c1)/n*100;
    double p2=double(c2)/n*100;
    double p3=double(c3)/n*100;
    double p4=double(c4)/n*100;
    printf("%.2lf%%\n%.2lf%%\n%.2lf%%\n%.2lf%%",p1,p2,p3,p4);
    return 0;
}