C :

#include<stdio.h>
#include<math.h>

int main()
{
	int x,y,i,s,d,n;
	while(scanf("%d%d",&x,&y)!=EOF)
	{
		d=y-x;
		n=sqrt(d);
		if(d<4)
			printf("%d\n",d);
		else
		{
			if(d==n*n)
				s=2*n-1;
			else if(d>n*n&&d<=n*n+n)
				s=2*n;
			else
				s=2*n+1;
			printf("%d\n",s);
		}
	}
	return 0;
}

C++ :

#include<stdio.h>
#include<math.h>

int main()
{
	int x,y,i,s,d,n;
	while(scanf("%d%d",&x,&y)!=EOF)
	{
		d=y-x;
		n=sqrt(d);
		if(d<4)
			printf("%d\n",d);
		else
		{
			if(d==n*n)
				s=2*n-1;
			else if(d>n*n&&d<=n*n+n)
				s=2*n;
			else
				s=2*n+1;
			printf("%d\n",s);
		}
	}
	return 0;
}

Pascal :

var a,b,s,i,j,n,m:longint;

begin
  while not eof do
    begin
      readln(a,b);
      s:=b-a;m:=1;n:=0;
      while s>0 do
        begin
          if s-m>0 then
              begin n:=n+2;s:=s-m*2;end
          else
              begin n:=n+1;s:=s-m;end;

          m:=m+1;
        end;
      writeln(n);
    end;
end.

Java :

import java.util.Scanner;


public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            int A = in.nextInt();
            int B = in.nextInt();
            if (B - A >= 0 && B - A <= 3) {
                System.out.println(B - A);
                continue;
            }

            int i = 1;
            int a = B - A;
            int res = 0;
            while (a >= 2 * i) {
                a -= 2 * i++;
                res += 2;
            }

            if (a <= i&&a>0) {
                res++;
            } else if (a > i) {
                res += 2;
            }

            System.out.println(res);
        }
    }
}