#include <iostream>
using namespace std;

class Stack {
public:
    int *arr; // properties
    int top;
    int size;

    // constructor
    Stack(int size) {
        this->size = size;
        arr = new int[size];
        top = -1;
    }

    // push function
    void push(int element) {
        if (size - top > 1) { // Check for empty space 
            top++;
            arr[top] = element;
        } else {
            cout << "Stack overflow" << endl;
        }
    }

    // pop function
    void pop() {
        if (top >= 0) {
            top--;
        } else {
            cout << "Stack underflow" << endl;
        }
    }

    // peek function
    int peek() {
        if (top >= 0) {
            return arr[top];
        } else {
            cout << "Stack is empty" << endl;
            return -1;
        }
    }

    // isEmpty function
    bool isEmpty() {
        return top == -1;
    }

    // delete stack function
    void deleteStack() {
        delete[] arr; // Free the allocated memory
        arr = nullptr; // Reset the pointer
        top = -1; // Reset the top
        size = 0; // Reset the size
        cout << "Stack has been deleted" << endl;
    }
};

int main() {
    Stack st(5);

    st.push(20);
    st.push(30);
    st.push(50);
    cout << "Top element before deletion: " << st.peek() << endl;

    st.deleteStack();

    // After deletion, trying to access the stack
    if (st.arr == nullptr) {
        cout << "Stack array is nullptr after deletion." << endl;
    }

    return 0;
}