[백준,c++] 10828번 - 스택

 

10828번: 스택

#include <iostream>
#include <stack>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    stack<int>st;

    int N; cin >> N;
    while (N--) {
        string cmd; cin >> cmd;
        if (cmd == "push") {
            int num; cin >> num;
            st.push(num);
        }
        else if (cmd == "top") {
            if (st.empty()) cout << -1<<"\n";
            else cout << st.top()<<"\n";
        }
        else if (cmd == "size") cout << st.size()<<"\n";
        else if (cmd == "pop") {
            if (st.empty()) cout << -1 << "\n";
            else {
                cout << st.top()<<"\n";
                st.pop();
            }
        }
        else if (cmd == "empty") {
            if (st.empty()) cout << 1 << "\n";
            else cout << 0 << "\n";
        }
    }

}