/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static int twiceIndex(int[] arr) {
int maxIndex = 0;
for (int i = 0; i < arr.length; ++i) {
if (arr[i] > arr[maxIndex])
maxIndex = i;
}
for (int i = 0; i < arr.length; ++i) {
if (maxIndex != i && arr[maxIndex] < 2 * arr[i])
return -1;
}
return maxIndex;
}
{
// your code goes here
int[] arr = {3, 6, 0, 1};
System.
out.
println(twiceIndex
(arr
)); }
}
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