I guess since the solution of this task is available anyway, for example, here http://acm.timus.ru/help.aspx?topic=scala , it won't hurt to share it.

import java.util.*;

public class T1001 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in); //initializing scanner to read data
        long a[] = new long[131072]; //an array to keep the numbers we read
        //Since the input is 256kb at most, in worst case it's 1-digit numbers
        //and spaces only, a bit more than 128k numbers,
        //or 131072 (2^17) to be precise.
        int i = 0; //a counter for amount of numbers we've read
        while (in.hasNextLong()) { //while there's a number of long type yet unread
            i++; //we increase the counter
            a[i] = in.nextLong(); //and read it into our array
        }
        //Here, we've just read all the numbers into an array, using nextLong.
        //It works with spaces AND with line breaks, what you said about it
        //working only for spaces is incorrect.
        for (i = i; i > 0; i--) { //for each number, from last one, to the first one
            System.out.println(Math.sqrt(a[i])); //output the square root for it
        }
    }
}

Personally though, i prefer this guy's AC code http://acm.timus.ru/forum/thread.aspx?id=31547&upd=635564450494489323 , but though it's more optimal, it's kinda harder to explain to a novice.

Edited by author 18.02.2016 04:41

Code from "post not said about line breaks, and code in start works only for line spaces" is:

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.*;

public class Try2 {

    public static void main(String[] args)
    {
        DecimalFormatSymbols s = new DecimalFormatSymbols();
        s.setDecimalSeparator('.');
        DecimalFormat f = new DecimalFormat("#,####0.0000",s);
        Scanner in = new Scanner(System.in);
        while (in.hasNextLong())
        {
        System.out.println(f.format(Math.sqrt(in.nextLong()) ));
        }
    }
}

Could you:
- run code locally with input like
-----
1 2 3
4
5
6
-----
- show output here
- type "sorry"
- think what do you do here if you don't understand other person code, don't want to run code and see it's behavior, and can't write your own.

P.S. - link to ideonline with code: https://ideone.com/Fddvox



Edited by author 18.02.2016 15:06