codeWars

using System.Linq;
using System.Collections.Generic;
public static class Groups
    {
        // "()" "{}" or "[]"
        private static Dictionary<char, char> matches = new Dictionary<char, char> {
            { '(', ')' },
            { '{', '}' },
            { '[', ']' },
        };
        public static bool Check(string input)
        {
            if (input.Length % 2 != 0) { return false; }
            string firstString = input.Substring(0, (input.Length / 2));
            string lastString = input.Substring(input.Length / 2, input.Length / 2);
            var firstArray = firstString.ToCharArray();
            var lastArray = lastString.Reverse().ToArray();
            for (int i = 0; i < firstArray.Length; i++)
            {
                if (matches[firstArray[i]] != lastArray[i])
                {
                    return false;
                }
            }
            return true;
        }
    }