[BOJ] 1159 농구 경기

https://www.acmicpc.net/problem/1159

1159번: 농구 경기

 

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

namespace _1159
{
    class Program
    {
        static void Main()
        {
            
            StreamReader sr = new StreamReader(Console.OpenStandardInput());
            //StringBuilder sb = new StringBuilder();
            StreamWriter sw = new StreamWriter(Console.OpenStandardOutput());

            int n = int.Parse(sr.ReadLine());

            int[] arr = new int[26];
            
            for (int i = 0; i < n; i++)
            {
                var name = sr.ReadLine(); 
                //Console.WriteLine(name[0] - 'a');
                arr[name[0] - 'a']++;
            }

            List<int> list = new List<int>();
            for (int i = 0; i<26; i++)
            {
                if (arr[i] >= 5)
                {
                    //sw.WriteLine(i + 'a');
                    list.Add(i + 'a');
                }
            }

            if (list.Count == 0)
            {
                sw.WriteLine("PREDAJA");
            }
            else
            {
                list.Sort();
                foreach (var ele in list)
                {
                    Console.Write((char)ele);
                }
            }

            sr.Close();
            sw.Close();
            
            
            
        }
    }
    
}