C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int arr[1000],n,i,a = 0,b = 0,c = 0,d = 0;
	cin>>n;
	for(i = 0;i < n;i++){
		cin>>arr[i];
		if(arr[i] <= 18){
			a++;
		}else if(arr[i] <= 35){
			b++;
		}else if(arr[i] <= 60){
			c++;
		}else{
			d++;
		}
	}
	
	cout<<a<<" "<<fixed<<setprecision(2)<<a*100.0/n<<"%"<<endl;
	cout<<b<<" "<<fixed<<setprecision(2)<<b*100.0/n<<"%"<<endl;
	cout<<c<<" "<<fixed<<setprecision(2)<<c*100.0/n<<"%"<<endl;
	cout<<d<<" "<<fixed<<setprecision(2)<<d*100.0/n<<"%"<<endl;
	
}

Java :

import java.text.NumberFormat;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
	       int n = sc.nextInt();
	       int[] a = new int[n];
	       for(int i=0;i<n;i++){
	           a[i] = sc.nextInt();
	       }
	       getCount(a);

	}
	public static void getCount(int[] a){
		int count1 = 0;int count2 = 0;int count3 = 0;int count4 = 0;
		double per1 = 0;double per2 = 0;double per3 = 0;double per4= 0;
		NumberFormat nt = NumberFormat.getPercentInstance();
		nt.setMinimumFractionDigits(2);
		for(int i = 0;i<a.length;i++){
			if(a[i] >=0 && a[i]<=18){
				count1++;
				per1 = count1*1.0/a.length;
			}else if(a[i] >=19 && a[i]<=35){
				count2++;
				per2 = count2*1.0/a.length;
			}if(a[i] >=36 && a[i]<=60){
				count3++;
				per3 = count3*1.0/a.length;
			}if( a[i]>=61){
				count4++;
				per4 = count4*1.0/a.length;
			}
		}
		System.out.println(count1 + " " +nt.format(per1));
		System.out.println(count2 + " " +nt.format(per2));
		System.out.println(count3 + " " +nt.format(per3));
		System.out.println(count4 + " " +nt.format(per4));
	}

}

Python :

n=int(input())
s1=list(map(int,input().split()))
alen=len([item for item in s1 if 0<=item<=18])
print("%d %.2lf%%"%(alen,100*alen/len(s1)))
alen=len([item for item in s1 if 19<=item<=35])
print("%d %.2lf%%"%(alen,100*alen/len(s1)))
alen=len([item for item in s1 if 36<=item<=60])
print("%d %.2lf%%"%(alen,100*alen/len(s1)))
alen=len([item for item in s1 if 61<=item])
print("%d %.2lf%%"%(alen,100*alen/len(s1)))