using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(IsValidParentheses("{{()}}".ToCharArray()));

    }

public static bool IsValidParentheses(char[] s) {

​

​

 while (s.ToString().Contains("{")||s.ToString().Contains("[")||s.ToString().Contains("("))

 {

             var h=0; //var z=0;

     for(int i=0 ; i<s.Length;i++)

     {

​

         switch (s[i])

         {

             case '{':

             case '[':

             case '(': h++ ; break;

            // case '}':

            // case ']':

            // case ')': z-- ; break;

         }

        if(h>0) 

        {

         for(int j=i, z=i,f=h; j>0 ; j--,z++,f--)

         {  

            if( z>=s.Length || f==0 ) break;

            if((s[j]=='{' && s[z]=='}') ||(s[j]=='[' && s[z]==']') ||(s[j]=='(' && s[z]==')') )  {s[j]=' '; s[z] =' ';}

             else return false;

         }

        }

         else { return false;}

     }

 }

​

    return true;

}

​

​

}