[백준-10828] 스택

<문제>

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<Code>

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

int main() {
  int n;
  cin>>n;

  stack<int> st; //int type의 stack 선언.
  string str;
  for(int i=0; i<n; i++){
    cin>>str;
    if(str=="push"){ //push 명령어 일때
      int num;
      cin>>num;
      st.push(num);
    }else if(str=="pop"){
      if(!st.empty()){
        cout<<st.top()<<endl;
        st.pop();
      }else{
        cout<< "-1"<<endl;
      }
    }else if(str=="size"){
      cout<<st.size()<<endl;
    }else if(str=="empty"){
      if(st.empty()){
        cout<<"1"<<endl;
      }else {
        cout<<"0"<<endl;
      }
    }else if(str=="top"){
      if(!st.empty()){
        cout<<st.top()<<endl;
      }else{
        cout<<"-1"<<endl;
      }
    }
  }
    return 0;
  }

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<Comment>

#include <stack>의 소중함^^ C로 구현할 생각하니 아찔

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www.acmicpc.net/problem/10828

10828번: 스택