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Catch That Cow(BFS)
Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts …
字符的全排列(DFS算法,java实现)
给定一个由不同的小写字母组成的字符串,输出这个字符串的所有全排列。 我们假设对于小写字母有'a' < 'b' < ... < 'y' < 'z',而且给定的字符串中的字母已经按照从小到大的顺序排列…