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Stack using 2 queue.cpp
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Stack using 2 queue.cpp
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/******************************************************************************
Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl,
C#, OCaml, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog.
Code, Compile, Run and Debug online from anywhere in world.
*******************************************************************************/
#include <bits/stdc++.h>
using namespace std;
class Stack
{
queue<int> q1,q2;
public:
void push(int x)
{
q2.push(x);
while(!q1.empty())
{
q2.push(q1.front());
q1.pop();
}
queue<int> q=q1;
q1=q2;
q2=q;
}
void pop()
{
if (q1.empty())
return;
q1.pop();
}
int top()
{
if (q1.empty())
return -1;
return q1.front();
}
int size()
{
return q1.size();
}
};
int main()
{
Stack s;
s.push(1);
s.push(2);
s.push(3);
s.push(4);
cout<<s.size()<<endl;
cout<<s.top()<<endl;
s.pop();
cout<<s.top()<<endl;
return 0;
}