A string of the characters '(' and ')' is given. It is determined whether it is a valid parenthesis expression. The maximum depth of nesting of brackets is determined.

Valid bracket expression

namespace MyCode
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const char OpenBrace = '(';
            const char CloseBrace = ')';

            int countBracesLevel = 0;
            int countBracesCorrectness = 0;
            string enteredBraces;

            enteredBraces = Console.ReadLine();

            foreach (char brace in enteredBraces)
            {
                switch (brace)
                {
                    case OpenBrace:
                        countBracesCorrectness++;
                        break;
                    case CloseBrace:
                        countBracesCorrectness--;
                        break;
                    default:
                        break;
                }

                if (countBracesCorrectness < 0)
                {
                    break;
                }

                countBracesLevel = countBracesCorrectness > countBracesLevel ? countBracesCorrectness : countBracesLevel;
            }

            if (countBracesCorrectness == 0)
            {
                Console.WriteLine($"Line is correct!");
                Console.WriteLine($"Max braces level: {countBracesLevel}");
            }

            else
            {
                Console.WriteLine("Line is incorrect!");
            }
        }
    }
}