Leetcode 472 Solution

class Solution {
public:
    vector<string> findAllConcatenatedWordsInADict(vector<string>& words) {
        vector<string> res;
        unordered_set<string> wordDict(words.begin(), words.end());
        for (int i = 0; i < words.size(); i++)
        {
            auto word = words[i];
            if (word.empty())
                continue;

            wordDict.erase(words[i]);

            bool dp[word.size() + 1];
            memset((void*)dp, 0, word.size() + 1);
            dp[0] = true;

            for (int i = 0; i <= word.size(); i++)
            {
                if (dp[i] == false)
                    continue;

                for (int j = i; j < word.size(); j++)
                    if (wordDict.find(word.substr(i, j - i + 1)) != wordDict.end())
                        dp[j + 1] = 1;

                if (dp[word.size()])
                {
                    res.push_back(word);
                    break;
                }
            }

            wordDict.insert(word);
        }

        return res;
    }
};