OJ-Problems-Source/HDOJ/2001_autoAC.cpp

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#include <cmath>
#include <cstdio>
int main(void)
{
double x[2], y[2];
while (scanf("%lf%lf%lf%lf", x, y, x+1, y+1) != EOF)
printf("%.2f\n", sqrt((x[1]-x[0])*(x[1]-x[0]) + (y[1]-y[0])*(y[1]-y[0])));
return 0;
}