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这题的表达是在太。。。。无语了。。。。看了半天才明白。。。还看不明白的朋友，来看看吧~大概意思是 有一段字符串，如果是字母开头的，此字母就变成后面变异数的总和 如果以数字开头，此数字变成N-1，然后从后面第N个开始变异 如果以0开头，就不变。 是个递归的过程 Followed by:
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