vector<string> wordSubsets(vector<string>& words1, vector<string>& words2) {

int maxCharFreq[26] = {0};

int tempCharFreq[26];

for (const auto& word : words2) {

memset(tempCharFreq, 0, sizeof tempCharFreq);

for (char ch : word) {

tempCharFreq[ch - 'a']++;

}

for (int i = 0; i < 26; ++i) {

maxCharFreq[i] = max(maxCharFreq[i], tempCharFreq[i]);

}

}

vector<string> universalWords;

for (const auto& word : words1) {

memset(tempCharFreq, 0, sizeof tempCharFreq);

for (char ch : word) {

tempCharFreq[ch - 'a']++;

}

bool isUniversal = true;

for (int i = 0; i < 26; ++i) {

if (maxCharFreq[i] > tempCharFreq[i]) {

isUniversal = false;

break;

}

}

if (isUniversal) {

universalWords.emplace_back(word);

}

}

return universalWords;

}