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问个hash的问题比如我想用hash来统计一个超常字符串(nG)里面a1a2a3..a10的十位字符串出现的频率('A'<=ai<='Z')
具体操作，想用10位26进制数来表示相应十位字符串。
但问题在于，这样的话就需要开26^11的数组了，怎么解决呢？
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