Poj Solution 2590

http://poj.org/problem?id=2590

//* @author: 82638882@163.com
import java.util.Scanner;
public class Main
{
 public static void main(String[] args)
 {
    Scanner in=new Scanner(System.in);
    int a=in.nextInt();
    for(int i=0;i< a;i++)
    {
          long x=in.nextLong();
      x=in.nextLong()-x;
      long b=(long)Math.sqrt(x);
      long ans=-1;
      if(b==0) ans=0;
      else if(b*b==x)ans=2*b-1;
      else if(x<=b*b+b)ans=2*b;
      else ans=2*b+1;
      System.out.println(ans);
     }
  }
}