Added Solution of 1st problem of DAY22 in C++; Updated README (#188)

Author: Razdeep

day22/C++/commonElements.cpp

@@ -0,0 +1,23 @@
+/**
+ * @author: Rajdeep Roy Chowdhury<rrajdeeproychowdhury@gmail.com>
+ * @github: https://github.com/razdeep
+ * @date: 18/01/2019
+ */
+#include <bits/stdc++.h>
+
+int main()
+{
+    std::vector<int> a = {1, 2, 3, 4, 5, 6, 8, 8, 7};
+    std::vector<int> b = {4, 2, 9, 1, 8};
+    std::sort(a.begin(), a.end());
+    auto last_ptr = std::unique(a.begin(), a.end());
+    a.resize(std::distance(a.begin(), last_ptr));
+
+    for (auto i : a)
+    {
+        if (std::find(b.begin(), b.end(), i) != b.end())
+            std::cout << i << std::endl;
+    }
+
+    return 0;
+}

day22/README.md

@@ -158,7 +158,34 @@ console.log (searchCommonElements ([0, 12, 41, 20], [9, 3, 1, 5]));
 ```
 
 ***
+## C++ Implementation
 
+### [Solution 1](./C++/commonElements.cpp)
+```cpp
+/**
+ * @author: Rajdeep Roy Chowdhury<rrajdeeproychowdhury@gmail.com>
+ * @github: https://github.com/razdeep
+ * @date: 18/01/2019
+ */
+#include <bits/stdc++.h>
+
+int main()
+{
+    std::vector<int> a = {1, 2, 3, 4, 5, 6, 8, 8, 7};
+    std::vector<int> b = {4, 2, 9, 1, 8};
+    std::sort(a.begin(), a.end());
+    auto last_ptr = std::unique(a.begin(), a.end());
+    a.resize(std::distance(a.begin(), last_ptr));
+
+    for (auto i : a)
+    {
+        if (std::find(b.begin(), b.end(), i) != b.end())
+            std::cout << i << std::endl;
+    }
+
+    return 0;
+}
+```
 ## Question 2
 
 ## JavaScript Implementation