南阳101

#include<stdio.h>
#include<math.h>
int main()
{
    int n;
    double x1,x2,y1,y2;
    scanf("%d",&n);
    while(n--)
    {
        scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
        printf("%.2lf
",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
    }
}