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  1. #include <iostream>
  2. #include <stack>
  3. using namespace std;
  4.  
  5. template<typename T>
  6. class Queue2Stack
  7. {
  8. 	stack<T> in, out;
  9. 	public:
  10. 	void push( const T& what )
  11. 	{
  12. 		while( !out.empty() )
  13. 		{
  14. 	    	in.push( out.top() );
  15. 	    	out.pop();
  16. 		}
  17. 		in.push( what );
  18. 	}
  19.  
  20. 	T pop()
  21. 	{
  22. 		while( !in.empty() )
  23. 		{
  24. 	    	out.push( in.top() );
  25. 	    	in.pop();
  26. 		}
  27. 		T result = out.top();
  28. 		out.pop();
  29. 		return result;
  30. 	}
  31. };
  32.  
  33. int main() {
  34. 	Queue2Stack<int> st;
  35. 	cout << "push 1, 2" << endl;
  36. 	st.push(1);
  37. 	st.push(2);
  38. 	cout << "pop " << st.pop() << endl;
  39. 	cout << "push 3, 4" << endl;
  40. 	st.push(3);
  41. 	st.push(4);
  42. 	cout << "pop " << st.pop() << ", ";
  43. 	cout << st.pop() << ", ";
  44. 	cout << st.pop() << endl;
  45.  
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
push 1, 2
pop 1
push 3, 4
pop 2, 3, 4
https://ideone.com/IzkGKU
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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