回複：回複：回複：C H A G E　ＦＲＯＭ 3)

來源: 於 2010-02-06 17:17:37 [舊帖] [給我悄悄話] 本文已被閱讀：次

it was by assuming no shotting in the air is allowed.

now here is a tricky add-on: what the solution is if shotting in the air is allowed?