题解 | #简单密码#

#include <cctype>
#include <iostream>
#include <unordered_map>
using namespace std;

int main() {
    string str;
    cin>>str;
    unordered_map<char, char>mp;
    mp['a']='2'; mp['b']='2'; mp['c']='2';
    mp['d']='3'; mp['e']='3'; mp['f']='3';  
    mp['g']='4'; mp['h']='4'; mp['i']='4';
    mp['j']='5'; mp['k']='5'; mp['l']='5';
    mp['m']='6'; mp['n']='6'; mp['o']='6';
    mp['p']='7'; mp['q']='7'; mp['r']='7'; mp['s']='7';
    mp['t']='8'; mp['u']='8'; mp['v']='8';
    mp['w']='9'; mp['x']='9'; mp['y']='9'; mp['z']='9';

    for(char &ch:str){
        if(ch>='A'&&ch<'Z'){
            ch=tolower(ch)+1;
        }else if(ch=='Z'){
            ch='a';
        }else if(ch>='a'&&ch<='z'){
            ch=mp[ch];
        }
    }
    cout<<str;
} 
// 64 位输出请用 printf("%lld")