import java.io.*;
import java.util.*;
public class ArrayStuff {
private int[] a;
private Random r;
public ArrayStuff() {
r = new Random();
a = new int[20];
for (int i=0;i<a.length;i++)
a[i]=r.nextInt(100);
}
public String toString() {
return Arrays.toString(a);
}
public int get(int n) {
return a[n];
}
public int findMaxIndex() {
int maxi = 0;
for (int i =0 ; i < a.length;i++) {
if (a[i]>a[maxi])
maxi = i;
}
return maxi;
}
public int find(int n) {
for (int i=0;i<a.length;i++) {
if (a[i]==n)
return i;
}
return -1;
}
public double mean() {
double avg = 0.0;
for (int i=0; i<a.length; i++) {
avg = avg + a[i];
}
avg = avg/a.length;
return avg;
}
public double stddev() {
double ans = 0.0;
double[] temp = new double[a.length];
for (int i=0; i<a.length; i++) {
temp[i] = (mean()-a[i]) * (mean()-a[i]);
}
for (int i=0; i<temp.length; i++) {
ans = ans + temp[i];
}
ans = ans/temp.length;
ans = Math.sqrt(ans);
return ans;
}
}