My code:
TimeLimitexed 9 tests:
help me if you know java



import java.io.*;
import java.util.*;

public class SumDif
{
   public static void main(String[] args) throws IOException
   {
      new SumDif().run();
   }
   int k=0;
   double[] a=new double[140000];;
   StreamTokenizer in;
   PrintWriter out;
   void oqi() throws IOException
   {
     while(in.nextToken()!=in.TT_EOF){
       a[k++]=(double)in.nval;
     }
     solve();
   }

   void run() throws  IOException
   {
      in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
      out = new PrintWriter(System.out);
      oqi();
      out.flush();
    }
   void solve() throws IOException
   {
    while(k>0)
     out.write(String.format("%.4f", Math.sqrt(a[--k]))+'\n');
   }
}