extraspace.cpp

#include <bits/stdc++.h>
using namespace std;
 

struct MyStack {
    stack<int> s;
    int minEle;

    void getMin()
    {
        if (s.empty())
            cout << "Stack is empty\n";
 
        
        else
            cout << "Minimum Element in the stack is: "
                 << minEle << "\n";
    }
 
 
    void peek()
    {
        if (s.empty()) {
            cout << "Stack is empty ";
            return;
        }
 
        int t = s.top(); // Top element.
 
        cout << "Top Most Element is: ";
 
       
        (t < minEle) ? cout << minEle : cout << t;
    }
 
    
    void pop()
    {
        if (s.empty()) {
            cout << "Stack is empty\n";
            return;
        }
 
        cout << "Top Most Element Removed: ";
        int t = s.top();
        s.pop();
 
        
        if (t < minEle) {
            cout << minEle << "\n";
            minEle = 2 * minEle - t;
        }
 
        else
            cout << t << "\n";
    }
 
  
    void push(int x)
    {
       
        if (s.empty()) {
            minEle = x;
            s.push(x);
            cout << "Number Inserted: " << x << "\n";
            return;
        }
 
        // If new number is less than minEle
        else if (x < minEle) {
            s.push(2 * x - minEle);
            minEle = x;
        }
 
        else
            s.push(x);
 
        cout << "Number Inserted: " << x << "\n";
    }
};
 
// Driver Code
int main()
{
    MyStack s;
   
    s.push(3);
    s.push(5);
    s.getMin();
    s.push(2);
    s.push(1);
    s.getMin();
    s.pop();
    s.getMin();
    s.pop();
    s.peek();
 
    return 0;
}