stl added

Author: gucci1909

map.cpp

@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    // key = value pair
+    // map store unique keys , in sorted order
+    map<int, int> mpp;
+
+    // everything is sorted
+    // multimap is key sorted but not unique
+    // TC - O(1)
+    // unordered_map is key unique but not sorted
+
+    for (const auto &pair : mpp)
+    {
+        cout << "Key: " << pair.first << ", Value: " << pair.second << endl;
+    }
+
+    return 0;
+}

set.cpp

@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    // everything is sorted and unique
+    set<int> s1;
+
+    s1.insert(1);
+    s1.insert(10);
+    s1.insert(10); // <-- will not add
+    s1.insert(5);
+
+    // everything is sorted
+    // multiset is sorted but not unique
+    // TC - O(1)
+    // unordered_set is unique but not sorted
+
+    cout << s1.size();
+
+    return 0;
+}