#include
#include
int main()
{
double x1,x2,y1,y2,root;
scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
root= sqrt(((x2-x1)*(x2-x1))+((y2-y1)*(y2-y1)));
printf("%.4f\n",root);
return 0;
}
#include
int main()
{
double x1,x2,y1,y2,root;
scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
root= sqrt(((x2-x1)*(x2-x1))+((y2-y1)*(y2-y1)));
printf("%.4f\n",root);
return 0;
}
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