Create 2227.Encrypt-and-Decrypt-Strings.cpp

Design/2227.Encrypt-and-Decrypt-Strings/2227.Encrypt-and-Decrypt-Strings.cpp

@@ -0,0 +1,51 @@
+class Encrypter {
+    unordered_map<char, string>Map1;
+    unordered_map<string, vector<char>>Map2;
+    unordered_map<string, int>count;
+
+public:
+    Encrypter(vector<char>& keys, vector<string>& values, vector<string>& dictionary) 
+    {
+
+        for (int i=0; i<keys.size(); i++)
+        {
+            Map1[keys[i]] = values[i];
+            Map2[values[i]].push_back(keys[i]);
+        }
+
+        for (auto s: dictionary)
+        {
+            string t = encrypt(s);
+            if (t!="") 
+                count[t]++;
+        }
+    }
+
+    string encrypt(string word1) 
+    {
+        string ret;
+        for (char ch: word1)
+        {
+            if (Map1.find(ch)==Map1.end())
+                return "";
+            ret += Map1[ch];
+        }
+
+        return ret;        
+    }
+
+    int decrypt(string word2) 
+    {
+        if (count.find(word2)==count.end())
+            return 0;
+        else
+            return count[word2];
+    }
+};
+
+/**
+ * Your Encrypter object will be instantiated and called as such:
+ * Encrypter* obj = new Encrypter(keys, values, dictionary);
+ * string param_1 = obj->encrypt(word1);
+ * int param_2 = obj->decrypt(word2);
+ */