题解 | 字符串加密

#include <bits/stdc++.h>
using namespace std;

int main() {
    string s, t;
    cin >> s >> t;
    map<char, bool> ma;
    string res;
    for (auto x: s) 
        if (!ma[x]) {
            ma[x] = true;
            res += x;
        }
    for (int i = 0; i < 26; i++) if (!ma[i + 'a']) res += i + 'a';
    for (auto x: t) cout << res[x - 'a']; 
}