[백준/C++] 10828번 스택

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#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;


int main() {
    int N, temp;
    cin >> N;
    string action;
    vector<int> arr;
    for(int i = 0; i < N; i++) {
        cin >> action;
        if(action == "push") {
            cin >> temp;
            arr.push_back(temp);
        } else if(action == "top") {
            arr.empty() ? cout << -1 << endl : cout << arr.back() << endl;
        } else if(action == "size") {
            cout << arr.size() << endl;
        } else if(action == "empty") {
            cout << arr.empty() << endl;
        } else {
            if(arr.empty()) cout << -1 << endl;
            else {
                cout << arr.back() << endl;
                arr.pop_back();
            }
        }
    }
}

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dd

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문제: https://www.acmicpc.net/problem/10828

10828번: 스택