백준 C# - 10828

Queue 알아보러가기

백준 C# - 10845

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace baek2
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());
            Stack<int>  stack= new Stack<int>();
            for (int i = 0; i<num; i++)
            {
                StringBuilder sb = new StringBuilder();
                string a = Console.ReadLine();
                string[] token = a.Split(' ');

                if (a.Contains("push"))
                {
                    int b = int.Parse(token[1]);
                    stack.Push(b);
                }
                else if (a.Contains("pop"))
                {
                    if (stack.Count == 0)
                    {
                        sb.Append(-1);
                    }
                    else
                        sb.Append(stack.Pop());
                }
                else if (a.Contains("empty"))
                {
                    int empty = (stack.Count() > 0) ? 0 : 1;
                    sb.Append(empty);
                }
                else if (a.Contains("top"))
                {
                    if (stack.Count == 0)
                    {
                        sb.Append(-1);
                    }
                    else
                        sb.Append(stack.Peek());
                }
                else if (a.Contains("size"))
                {
                    sb.Append(stack.Count());
                }
                if(!a.Contains("push"))
                    Console.WriteLine(sb.ToString());
            }
        }
    }
}