HackerRank: Game Throne -

GameThrone3.cs

using System;
using System.Collections.Generic;
using System.IO;
class Solution
{
    static void Main(String[] args)
    {
        string input = Console.ReadLine();
        int[] count = new int[26];

        foreach (char c in input)
            count[c - 'a']++;

        int odd = 0;

        for (int i = 0; i < 26; i++)
            if (count[i] % 2 == 1) odd++;

        if (odd <= 1)
            Console.WriteLine("YES");
        else
            Console.WriteLine("NO");
    }
}