题解 | #字符串加密#

#include <array>
#include <iostream>
#include <map>
using namespace std;

int main() {
    string s1, s2, output;
    map<char, bool> mp = {};
    cin >> s1;
    for (char i : s1) {
        if (!mp[i]) {
        output += i;
        }       
        mp[i] = true;
    }   
    mp.clear();
    array<char, 26> res;
    for (int i = 0; i < output.size(); i++) {
        res[i] = output[i];
        mp[output[i]] = true;
    }
    
    char str = 'a';
    for (int i = output.size(); i < 26; i++) {
        while (mp[str]) {
            str++;
        }
        res[i] = str;
        str++;
    }
    cin >> s2;
    for (int i = 0; i < s2.size(); i++) {
       s2[i] = res[s2[i] - 'a']; 
    } 
    cout << s2;

}
// 64 位输出请用 printf("%lld")