Create _916

Solution for the leetcode daily question 
916. Word Subsets

Author: yashgarg7302

Diff for: cpp/_916

@@ -0,0 +1,34 @@
+class Solution {
+public:
+    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;
+    }
+};