03. Maximum and Minimum Element

#include <iostream>
#include <stack>

using namespace std;

int main() {
    int n, command, number;
    cin >> n;

    stack<int> numbers, s;

    for (int i = 0; i < n; i++) {
        cin >> command;

        if (command == 1) {
            cin >> number;
            numbers.push(number);
        }
        else if (numbers.size() > 0) {

            if (command == 2) {
                numbers.pop();
            }
            else {
                int max = -2147483646, min = 2147483647;

                s = numbers;
                while (s.size() != 0) {
                    if (s.top() > max) {
                        max = s.top();
                    }
                    if (s.top() < min) {
                        min = s.top();
                    }
                    s.pop();
                }

                cout << (command == 3 ? max : min) << endl;
            }
        }
    }

    if (numbers.size() > 0) {
        while (numbers.size() != 1) {
            cout << numbers.top() << ", ";
            numbers.pop();
        }
        cout << numbers.top() << endl;
    }

    return 0;
}