1935. 可以输入的最大单词数

class Solution {
public:
    int canBeTypedWords(string text, string brokenLetters) {
        unordered_set<char> brokenSet;
        for(auto c: brokenLetters) brokenSet.insert(c);
        int res = 0;
        bool flag = true;
        for(auto c: text){
            if(c == ' '){
                if(flag) res ++;
                else flag = true;
            }
            else if(brokenSet.count(c)) flag = false;
        }
        if(flag) res ++;
        return res;
    }
};