利用string建立map对应，利用str.find()查找索引 #include<iostream> #include<string> using namespace std; int main() { string input,output; cin>>input; string a={"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"}; string b={"bcdefghijklmnopqrstuvwxyza222333444555666...