Two string - Dictionary<char, bool>

TwoString17.cs

using System;
using System.Collections.Generic;
using System.IO;

class Solution
{
    static void Main(String[] args)
    {
        var testCount = Convert.ToInt32(Console.ReadLine());

        for (var t = 1; t <= testCount; t++)
        {
            var a = Console.ReadLine();
            var b = Console.ReadLine();

            var c = new Dictionary<char, bool>();
            foreach (var p in b)
                if (!c.ContainsKey(p))
                    c.Add(p, true);

            var noAnswer = true;

            foreach (var p in a)
                if (c.ContainsKey(p))
                {
                    Console.WriteLine("YES");
                    noAnswer = false;
                    break;
                }

            if (noAnswer)
                Console.WriteLine("NO");
        }
    }
}