Hi! I have added my name

README.md

@@ -19,3 +19,6 @@ A repo for Contribution done during HacktoberFestKarunya 2019
 ```
 
 
+### https://docs.google.com/presentation/d/1KTmGjuUhnXCPwni3B8-mLYL-8ygUHl1x5BfxVDuJ3UM/edit?usp=sharing
+
+

third/third.md

@@ -1 +1,37 @@
-Third year contribution are kept under this profile
+// CPP program to demonstrate working of STL stack 
+#include <iostream> 
+#include <stack> 
+using namespace std; 
+
+void showstack(stack <int> s) 
+{ 
+	while (!s.empty()) 
+	{ 
+		cout << '\t' << s.top(); 
+		s.pop(); 
+	} 
+	cout << '\n'; 
+} 
+
+int main () 
+{ 
+	stack <int> s; 
+	s.push(10); 
+	s.push(30); 
+	s.push(20); 
+	s.push(5); 
+	s.push(1); 
+
+	cout << "The stack is : "; 
+	showstack(s); 
+
+	cout << "\ns.size() : " << s.size(); 
+	cout << "\ns.top() : " << s.top(); 
+
+
+	cout << "\ns.pop() : "; 
+	s.pop(); 
+	showstack(s); 
+
+	return 0; 
+}