ITSA 47 [Problem 5] Geodesic Distance

http://e-tutor.itsa.org.tw/e-Tutor/mod/programming/view.php?id=30637

這題請參考這篇文章當S或W時要變成負數
http://fecbob.pixnet.net/blog/post/43546822-%5Bjava%5D-%E7%B6%93%E7%B7%AF%E5%BA%A6%E8%B7%9D%E9%9B%A2%E8%A8%88%E7%AE%97