2019-05-18

09:51:19

加油，加油，fightting !!!

https://www.cnblogs.com/ECJTUACM-873284962/p/6375011.html

全为aaaaaa的情况一定要注意

#include <bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    int j, i;
    int flat = 0;
    cin >> s;
    for (i = 0; i < s.length(); i++)
    {
        if (s[i] != 'a')
        {
            s[i] = s[i] - 1;
            flat = 1;
        }
        else if (s[i] == 'a' && flat == 1)
        {
            break;
        }
    }
    if(flat == 0)
    {
        s[s.length() - 1] = 'z';
    }
    for (i = 0; i < s.length(); i++)
    {
        cout << s[i];
    }
    return 0;
}