很简单的题目，感觉加上了类之后，编程了一道medium的题目

class MagicDictionary {

private:
    vector<string> dict;

    bool compare(string a,string b){

        if(a.size()!=b.size())
            return false;

        int count =0 ;
        for(int i=0;i<a.size();i++)
        {
            if(a[i]!=b[i])
                count++;

            if(count>=2)
                break;


        }

        return (count==1);

    }
public:
    /** Initialize your data structure here. */
    MagicDictionary() {

    }

    /** Build a dictionary through a list of words */
    void buildDict(vector<string> dict) {
        this->dict = dict;
    }

    /** Returns if there is any word in the trie that equals to the given word after modifying exactly one character */
    bool search(string word) {
        for(int i=0;i<dict.size();i++)
        {
            if(compare(dict[i],word))
                return true;
        }

        return false;

    }
};

/**
 * Your MagicDictionary object will be instantiated and called as such:
 * MagicDictionary obj = new MagicDictionary();
 * obj.buildDict(dict);
 * bool param_2 = obj.search(word);
 */