🔡 Day 22

Author: Akash Rajpurohit

README.md

@@ -29,10 +29,10 @@
 4. [Merge Intervals](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/566/week-3-november-15th-november-21st/3535/) ➡️ [CPP Solution](Week3/merge.cpp)
 5. [Decode String](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/566/week-3-november-15th-november-21st/3536/) ➡️ [CPP Solution](Week3/decodeString.cpp)
 6. [Search in Rotated Sorted Array II](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/566/week-3-november-15th-november-21st/3537/) ➡️ [CPP Solution](Week3/search.cpp)
-7. [Numbers At Most N Given Digit Set](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/566/week-3-november-15th-november-21st/3537/) ➡️ [CPP Solution](Week3/atMostNGivenDigitSet.cpp)
+7. [Numbers At Most N Given Digit Set](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/566/week-3-november-15th-november-21st/3538/) ➡️ [CPP Solution](Week3/atMostNGivenDigitSet.cpp)
 
 ## Week 4 🚧
-Coming soon...
+1. [Unique Morse Code Words](https://leetcode.com/explore/challenge/card/november-leetcoding-challenge/567/week-4-november-22nd-november-28th/3540/) ➡️ [CPP Solution](Week4/uniqueMorseRepresentations.cpp)
 
 ## Week 5 🚧
 Coming soon...

Week4/uniqueMorseRepresentations.cpp

@@ -0,0 +1,19 @@
+class Solution {
+public:
+    int uniqueMorseRepresentations(vector<string>& words) {
+        vector<string> code = {".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};
+        
+        unordered_set<string> s;
+        
+        for(string word: words) {
+            string str = "";
+            for(char c: word) {
+                int idx = c - 'a';
+                str.append(code[idx]);
+            }
+            s.insert(str);
+        }
+        
+        return s.size();
+    }
+};