age and disease

3: Age and Disease

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Total time limit: 

1000ms

Memory limit: 

65536kB

describe

A hospital wants to count whether the acquisition of a certain disease is related to age. It needs to sort out the previous diagnosis records and count according to the four age groups of 0-18, 19-35, 36-60, 61 and above (including 61). the proportion of patients with the disease to the total number of patients.

enter

There are 2 lines in total, the first line is the number n of past patients (0 < n <= 100), and the second line is the age of each patient at the time of illness.

output

According to the four age groups of 0-18, 19-35, 36-60, 61 and above (including 61), output the proportion of the number of patients in this period to the total number of patients, output in the form of a percentage, accurate to two decimal places. One row for each age group, four rows in total.

sample input

10
1 11 21 31 41 51 61 71 81 91

Sample output

20.00%
20.00%
20.00%
40.00%

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	const int MAX=200;
	int one=0,two=0,thr=0,four=0;
	double x,y,o,p;
	int a[MAX];
	int n;
	
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
		if(a[i]>=0&&a[i]<=18) one++;
		else if(a[i]>=19&&a[i]<=35) two++;
		else if(a[i]>=36&&a[i]<=60) thr++;
		else if(a[i]>=61) four++;
	}
	
	x = (double)one/n*100;
	y = (double)two/n*100;
	o = (double)thr/n*100;
	p = (double)four/n*100;
	
	cout<<setiosflags(ios::fixed)<<setprecision(2)<<x<<"%"<<endl;
	cout<<setiosflags(ios::fixed)<<setprecision(2)<<y<<"%"<<endl;
	cout<<setiosflags(ios::fixed)<<setprecision(2)<<o<<"%"<<endl;
	cout<<setiosflags(ios::fixed)<<setprecision(2)<<p<<"%"<<endl;
	
	
	return 0;
}