delete pics to save space

history_source/信息学奥赛一本通/1.2.6.5.cpp

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+#include<cstdio>
+#include<cmath>
+using namespace std;
+struct Point
+{
+	double x,y;
+};
+int main()
+{
+	Point p1,p2;
+	scanf("%lf%lf%lf%lf",&p1.x,&p1.y,&p2.x,&p2.y);
+	double a=abs(p1.x-p2.x),b=abs(p1.y-p2.y),c=sqrt(a*a+b*b);
+	printf("%.3lf\n",c);
+	return 0;
+}
+