> #include<iostream>
> #include<cmath>
> using namespace std;
> int main()
> {
> 	int n,t,p;
> 	long a,b;
> 	float d;
> 	cin>>n;
> 	while(n>0)
> 	{
> 		cin>>a>>b;
> 		if(a==b) 
> 		{
> 			p=0;
> 		}
> 		else
> 		{
> 			d=sqrt(4.0*(b-a));
> 			t=(int)d;
> 			if(t<d) p=t;
> 			else p=t-1;			
> 		}
> 		cout<<p<<endl;
> 		n--;
> 	}
> 	return 0;
> }