文件名称:perm
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功能：输出排列组合序列。
参数：str字符集和，index集合起始下标，size集合大小。-Features: Output sequence of permutations and combinations. Parameters: str character set and, index set the starting index, size size of the collection.
参数：str字符集和，index集合起始下标，size集合大小。-Features: Output sequence of permutations and combinations. Parameters: str character set and, index set the starting index, size size of the collection.
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perm.cpp