题解 | #手机键盘#

#include <iostream>
#include<vector>
using namespace std;

int main() {
    vector<int> first_character={0,3,6,9,12,15,19,22};
    string str;
    while (cin >> str) { // 注意 while 处理多个 case
        int res=0,pre=-1,last;
        for(int i=0;i<str.size();i++){
            int index=1,c=str[i]-'a';
            while(index<first_character.size()&&first_character[index]<=c) index++;
            last=index-1;
            if(last==pre)
                res+=2;
            res+=c-first_character[last]+1;
            pre=last;
        }
        cout<<res<<endl;
    }
}
// 64 位输出请用 printf("%lld")