9 Task C#.txt

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp8
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            char[] arr = str.ToArray();
            bool[] intervalArr = new bool[str.Length + 1];
            bool flag = false;

            int Q = Convert.ToInt32(Console.ReadLine());
            for (int counter = 0; counter < Q; counter++)
            {
                string[] thisStrArr = newSplit(Console.ReadLine());
                int first = Convert.ToInt32(thisStrArr[0]);
                int second = Convert.ToInt32(thisStrArr[1]);
                if (first != second)
                {
                    if (first > second)
                    {
                        int temp = first;
                        first = second;
                        second = temp;
                    }

                    first--;
                    intervalArr[first] = !intervalArr[first];
                    intervalArr[second] = !intervalArr[second];
                }
                else
                {
                    first--;
                    if (arr[first] <= 90) arr[first] = Convert.ToChar(Convert.ToInt32(arr[first]) + 32);
                    else arr[first] = Convert.ToChar(Convert.ToInt32(arr[first]) - 32);
                }
            }
            for (int index = 0; index < str.Length; index++)
            {
                if (intervalArr[index]) flag = !flag;
                if (flag)
                {
                    if (arr[index] <= 90) arr[index] = Convert.ToChar(Convert.ToInt32(arr[index]) + 32);
                    else arr[index] = Convert.ToChar(Convert.ToInt32(arr[index]) - 32);
                }
            }
            Console.WriteLine(new string(arr));
            Console.ReadKey();
        }

        static string[] newSplit(string text)
        {
            int index;
            int lastIndex = 0;
            List<string> words = new List<string>();
            while ((index = text.IndexOf(' ', lastIndex)) != -1)
            {
                words.Add(text.Substring(lastIndex, index - lastIndex));
                lastIndex = index + 1;
            }
            words.Add(text.Substring(lastIndex));
            return words.ToArray();
        }
    }
}