Time Limit: 2 Seconds
Memory Limit: 65536 KB
As a member of an ACM programming team you'll soon find yourself always traveling
around the world: Z��rich, Philadelphia, San Jos��, Atlanta,... from 1999 on the
Contest Finals even will be on a different continent each year, so one day you
might get to Japan or Australia.
At the contest site it would be interesting to know how many miles you are away
from home. For this sake, your job is to write a program to compute the geographical
distance between two given locations on the Earth's surface.
We assume that the Earth is a perfect sphere with a radius of exactly 6378 km.
The geographical distance between A and B is the length of the geodetic line segment
connecting A and B.
The geodetic line segment between two points on a sphere is the shortest connecting
curve lying entirely in the surface of the sphere.
The value of pi is approximately 3.141592653589793.
The input will consist of two parts: a list of cities and a list of queries.
The city list consists of up to 100 lines, one line per city. Each line will
contain a string ci and two real numbers lati and longi, representing the city
name, its latitude and its longitude, respectively.
The city name will be shorter than 30 characters and will not contain white-space
The latitude will be between -90 (South Pole) and +90 (North Pole). The longitude
will be between -180 and +180 where negative numbers denote locations west of
the meridian and positive numbers denote locations east of the meridian. (The
meridian passes through Greenwich, London.)
The city list will be terminated by a line consisting of a single "#".
Each line will contain two city names A and B.
The query list will be terminated by the line "# #".
For each query, print a line saying "A - B" where A and B are replaced
by the city names. Then print a line saying x km" where x is replaced by
the geographical distance (in km) between the two cities, rounded to the nearest
If one of the cities in the query didn't occur in the city list, print a line
saying "Unknown" instead.
Ulm 48.700 10.500
Freiburg 47.700 9.500
Philadelphia 39.883 -75.250
SanJose 37.366 -121.933
NorthPole 90 0
SouthPole -90 0
Ulm - Philadelphia
Ulm - SanJose
Freiburg - Philadelphia
Freiburg - SanJose
Ulm - Freiburg
SanJose - Philadelphia
Ulm - LasVegas
Ulm - Ulm
Ulm - NorthPole
Ulm - SouthPole
NorthPole - SouthPole
Source: University of Ulm Local Contest 1997