> #include <stdio.h>
> 
> int main(void)
> {
> 	int ncases;
> 	int a,b,len;
> 	scanf("%d",&ncases);
> 
> 	while(ncases--)
> 	{
> 		scanf("%d %d",&a,&b);
> 		len=b-a;
> 
> 		int temp=0;
> 		int index;
> 		for(int i=0;;++i)
> 		{
> 			if(len<=temp+(i+1)/2)
> 			{
> 				index=i;
> 				break;
> 			}
> 			temp+=(i+1)/2;
> 		}
> 		printf("%d\n",index);
> 	}
> 
> 	return 0;
> }