can someone help?

Ali Tamim (5)
how to implement the main queue functions Enque() and Deque() using two stacks S1 & S2?

You allowed only to call push () and pop() functions of the two stacks to implement Enque()and Deque() functions.
Esslercuffi (272)
are you using standard library stacks, or a self-built stack?
Last edited on
Ali Tamim (5)
standard ones
MiiNiPaa (5455)
Something like that?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
#include <iostream>
#include <stack>

template<typename T>
class double_stack_queue
{
    std::stack<T> S1;
    std::stack<T> S2;
public:
	void enqueue(const T& in)
	{
	    S1.push(in);
	}

	T dequeue() //Does not works like standard queue
	{
		while(!S1.empty()) {
			S2.push(S1.top());
			S1.pop();
		}
		T temp = S2.top();
		S2.pop();
		while(!S2.empty()) {
			S1.push(S2.top());
			S2.pop();
		}
		return temp;
	}
};

int main()
{
	double_stack_queue<int> foo;
	foo.enqueue(5);
	foo.enqueue(7);
	foo.enqueue(10);

	std::cout << foo.dequeue();
}
Registered users can post here. Sign in or register to post.

C++

Forum