#include<iostream>#include<queue>#include<cstdio>#include<algorithm>#include<cstring>#include<iomanip>#include<map>#include<cstdlib>#include<cmath>#include<vector>#define LL long long#define IT __int64#define zero(x) fabs(x)<eps#define mm(a,b) memset(a,b,sizeof(a))const int INF=0x7fffffff;const double inf=1e8;const double eps=1e-8;const double PI=acos(-1.0);const int Max=20001;const double R=3437.5;using namespace std;int sign(double x){ return (x>eps)-(x<-eps);}typedef struct Node{ double x; double y; Node(const double &_x=0, const double &_y=0) : x(_x), y(_y) {} void input() { cin>>x>>y; } void output() { cout<<x<<" "<<y<<endl; }}point;double xmult(point p0,point p1,point p2){return(p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y);}double dmult(point p0,point p1,point p2){return(p1.x-p0.x)*(p2.x-p0.x)+(p1.y-p0.y)*(p2.y-p0.y);}double Distance(point p1,point p2){return( sqrt( (p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y) ) );}double Distance_Angle(double Angle_1,double Angle_2,double Angle_3,double Angle_4){ double theta,dis; Angle_1=Angle_1*PI/180; Angle_2=Angle_2*PI/180; Angle_3=Angle_3*PI/180; Angle_4=Angle_4*PI/180; theta=acos(cos(Angle_1)*cos(Angle_3)*cos(Angle_2-Angle_4)+sin(Angle_1)*sin(Angle_3)); dis=theta*R; return dis;}int main(){ int n,m,i,j; int HH,MM,SS; double dis; double x1,x2,x3; double y1,y2,y3; double a1,a2,a3; double b1,b2,b3; double Angle_1,Angle_2,Angle_3,Angle_4; char str1[100],str2[100],str3[100],str4[100],str5[100]; char c1,c2,c3; while(scanf("%s",&str1)!=EOF) { getchar(); scanf("%c%d%c",&c1,&n,&c2); scanf("%s%s",&str1,&str2); scanf("%d:%d:%d.",&HH,&MM,&SS); scanf("%s%s%s%s",&str1,&str2,&str3,&str4); scanf("%lf%c%lf%c%lf%c",&x1,&c1,&x2,&c2,&x3,&c3); Angle_1=x1+x2/60+x3/3600; scanf("%s",&str1); if(str1[0]=='S')//鍗楃粡鐨勭偣鍊兼槸璐熷� Angle_1=-Angle_1; scanf("%s",&str1); scanf("%lf%c%lf%c%lf%c",&y1,&c1,&y2,&c2,&y3,&c3); Angle_2=y1+y2/60+y3/3600; scanf("%s",&str1); if(str1[0]=='W') Angle_2=-Angle_2; scanf("%s%s%s%s%s",&str1,&str2,&str3,&str4,&str5); scanf("%lf%c%lf%c%lf%c",&a1,&c1,&a2,&c2,&a3,&c3); Angle_3=a1+a2/60+a3/3600; scanf("%s",&str1); if(str1[0]=='S') Angle_3=-Angle_3; scanf("%s",&str1); scanf("%lf%c%lf%c%lf%c",&b1,&c1,&b2,&c2,&b3,&c3); Angle_4=b1+b2/60+b3/3600; scanf("%s",&str1); if(str1[0]=='W') Angle_4=-Angle_4; scanf("%s",&str1); dis=Distance_Angle(Angle_1,Angle_2,Angle_3,Angle_4); cout<<"The distance to the iceberg: "<<setprecision(2)<<setiosflags(ios::fixed)<<dis<<" miles."<<endl; if(sign(dis-100+0.005)<0) cout<<"DANGER!"<<endl; } return 0;}
