og 12 problem solving 191 题，og 解释是列出不同的路径，从而得出答案10条路线。请问有其他办法解题吗，og的方法太费时间，而且容易数错。
Pat will walk from intersection x to intersection y along a route that is confined to the square grid of four streets and three avenue shown in the map. How many routes from x to y can pat take that have the minimum possible length?
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2014-1-3 12:17:57
收藏
收藏
