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头文件 #include<string>
名称空间 std
std::to_string()
std::stoll(str,*,0)
string::substr(pos,length = npos) //pos start at 0
std::size_t found = string::find_first_not_of(string("abcdefghijklmnopqrstuvwxyz "))
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原文地址:http://blog.csdn.net/calmreason/article/details/42874007