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求大神解释 为什么每次都只要从A1开始遍历

Posted by x604078488 at 2013-11-16 19:32:24 on Problem 2488 and last updated at 2013-11-16 19:55:54 
存不存在一种情况就是从A2开始遍历存在路径但是从A1开始遍历不存在路径的情况？那样A3就是字典序最小的，应该输出A2的那条路径啊；
为什么大家都是只从A1开始遍历，是不是只要存在一条路径可以遍历所有方格那么肯定存在一条A1开头的可以遍历所有方格的路径？
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