12

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {

        private static bool RemoveSpaces(Char charToCheck)
        {
            return charToCheck.Equals(' ');
        }

        public static List<String> funct(String stringToProceed)
        {

            List<Char> myString = new List<Char>(stringToProceed);

            myString.RemoveAll(RemoveSpaces);

            String myFunction = new String(myString.ToArray());

            int index = 0;
            int bracketsIndicator = 0;
            int indexOfBeginingOfSubstring = 0;
            int indexOfEndOfSubstring = 0;
            int lenghtOfSubstring = 0;

            List<String> substrings = new List<String>();

            Boolean boundaryIsReached = false;

            while (!boundaryIsReached)
            {
                indexOfEndOfSubstring = index;
                if (myFunction[index].Equals('('))
                {
                    bracketsIndicator++;
                }
                else
                {
                    if (myFunction[index].Equals(')'))
                    {
                        bracketsIndicator--;
                    }
                    else
                    {
                        if (bracketsIndicator == 0)
                        {
                            if (myFunction[index].Equals('+') || myFunction[index].Equals('*') ||
                                myFunction[index].Equals('/') || myFunction[index].Equals('^') || myFunction[index].Equals('-'))
                            {
                                if (myFunction[index].Equals('-') && index == indexOfBeginingOfSubstring)
                                {
                                    substrings.Add(new String("-".ToArray()));
                                    indexOfBeginingOfSubstring = index + 1;
                                }
                                else
                                {
                                    indexOfEndOfSubstring = index - 1;
                                    lenghtOfSubstring = indexOfEndOfSubstring - indexOfBeginingOfSubstring + 1;
                                    if (myFunction[indexOfBeginingOfSubstring].Equals('(') && myFunction[indexOfEndOfSubstring].Equals(')'))
                                    {
                                        indexOfBeginingOfSubstring++;
                                        lenghtOfSubstring -= 2;
                                    }
                                    substrings.Add(new String(myFunction.Substring(indexOfBeginingOfSubstring, lenghtOfSubstring).ToCharArray()));
                                    substrings.Add(new String(myFunction.Substring(index, 1).ToCharArray()));
                                    indexOfBeginingOfSubstring = index + 1;
                                }
                            }
                        }
                    }
                }

                index++;

                if (index == myFunction.Length)
                {
                    if (bracketsIndicator == 0)
                    {
                        if (!myFunction[index - 1].Equals('+') && !myFunction[index - 1].Equals('*') &&
                            !myFunction[index - 1].Equals('/') && !myFunction[index - 1].Equals('^') && !myFunction[index - 1].Equals('-'))
                        {
                            indexOfEndOfSubstring = index - 1;
                        }
                        else
                        {
                            indexOfEndOfSubstring = (index--) - 1;
                        }
                        lenghtOfSubstring = indexOfEndOfSubstring - indexOfBeginingOfSubstring + 1;
                        if (myFunction[indexOfBeginingOfSubstring].Equals('(') && myFunction[indexOfEndOfSubstring].Equals(')'))
                        {
                            indexOfBeginingOfSubstring++;
                            lenghtOfSubstring -= 2;
                        }
                        substrings.Add(new String(myFunction.Substring(indexOfBeginingOfSubstring, lenghtOfSubstring).ToCharArray()));
                    }
                    boundaryIsReached = true;
                }
            }
            return substrings;
        }

        static void Main(string[] args)
        {

            while (true)
            {
                Console.WriteLine("Enter something");
                String initialString = Console.ReadLine();

                List<String> foundSubstring = funct(initialString);

                foundSubstring.ForEach(delegate(String str)
                {
                    Console.WriteLine(str);
                });


                Console.Write('\n');
            }
        }
    }
}