delete pics to save space

2.11817.cpp

@@ -0,0 +1,48 @@
+#include<cstdio>
+#include<cmath>
+struct Point3
+{
+	double x,y,z;
+	Point3(double _x=0,double _y=0,double _z=0):x(_x),y(_y),z(_z) { }
+};
+Point3 operator-(Point3 A,Point3 B)
+{ return Point3(A.x-B.x,A.y-B.y,A.z-B.z); }
+double Length(Point3 p)
+{ return sqrt(p.x*p.x+p.y*p.y+p.z*p.z); }
+
+const double Pi=acos(-1);
+inline double D_to_R(double D)
+{ return Pi/180*D; }
+void get_coord(double R,double lat,double lng,Point3 &p)
+{
+	lat=D_to_R(lat);
+	lng=D_to_R(lng);
+	p.x=R*cos(lat)*cos(lng);
+	p.y=R*cos(lat)*sin(lng);
+	p.z=R*sin(lat);
+}
+using namespace std;
+int n;
+double lat1,lng1,lat2,lng2;
+const double R=6371009;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	while(n-->0)
+	{
+		scanf("%lf%lf%lf%lf",&lat1,&lng1,&lat2,&lng2);
+		if(lat1<0) lat1+=360;
+		if(lng1<0) lng1+=360;
+		if(lat2<0) lat2+=360;
+		if(lng2<0) lng2+=360;
+		Point3 A,B;
+		get_coord(R,lat1,lng1,A);
+		get_coord(R,lat2,lng2,B);
+		double d=Length(A-B);
+		printf("%.0lf\n",2*asin(d/(2*R))*R-d);
+	}
+	return 0;
+}