953. Verifying an Alien Dictionary

class Solution {
public:
    bool isAlienSorted(vector<string>& words, string order) {
        int mapping[26];
        for (int i = 0; i < 26; ++i)
            mapping[order[i] - 'a'] = i;
        
        for (auto& w : words) {
            for (auto& c : w) {
                c = mapping[c - 'a'];
            }
        }
        return is_sorted(words.begin(), words.end());
    }
};

특수한 order를 일반적인 order로(integer order) 변환