Untitled

using System;
using System.Collections.Generic;

class CaesarCipherWithSubstrings
{
    static string CaesarShift(string str, int shift)
    {
        char[] charArray = str.ToCharArray();
        for (int i = 0; i < charArray.Length; i++)
        {
            if (char.IsLetter(charArray[i]))
            {
                char baseChar = char.IsUpper(charArray[i]) ? 'A' : 'a';
                charArray[i] = (char)(((charArray[i] - baseChar + shift) % 26 + 26) % 26 + baseChar);
            }
        }
        return new string(charArray);
    }

    static string Solve(string s, List<Tuple<int, int, int>> operations)
    {
        char[] result = s.ToCharArray();

        foreach (var operation in operations)
        {
            int start = operation.Item1;
            int end = operation.Item2;
            int shift = operation.Item3;

            for (int i = start; i <= end; i++)
            {
                if (char.IsLetter(s[i]))
                {
                    result[i] = CaesarShift(result[i].ToString(), shift)[0];
                }
            }
        }

        return new string(result);
    }

    static void Main(string[] args)
    {
        string s = "abcdefg";
        List<Tuple<int, int, int>> operations = new List<Tuple<int, int, int>>()
        {
            Tuple.Create(1, 3, 2),
            Tuple.Create(4, 5, 1)
        };

        string result = Solve(s, operations);
        Console.WriteLine(result); // Output: "abdgfg"
    }
}