백준 5단계(1546)

package algo.fifth.a1546;
 
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
 
public class Main {
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
        //receives input and divides by stringtokeinzer
        int n = Integer.parseInt(br.readLine());
        double[] arr = new double[n];
        String str = br.readLine();
        StringTokenizer st = new StringTokenizer(str);
        
        //max for finding the highest number
        double max = 0;
        int t = 0;
        
        while(st.hasMoreTokens()) {
            arr[t] = Integer.parseInt(st.nextToken());
            if(max < arr[t]) max = arr[t];
            t++;
        }
        
        //doulbe is used for avg, followed the given equation to solve
        double avg = 0;
        t = 0;
        for(; t < arr.length; t++) {
            arr[t] = (arr[t]/ max) * 100;
            avg += arr[t];
        }
        avg /= n;
        bw.write(String.valueOf(avg));
        bw.flush();
        
    }
}