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program.cs

using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

namespace HackerRank
{
    static class Helper
    {
         
    }
    class Program
    {
        static int I(string str, int index)
        {
            if (str == null) return -1;
            if (str.Length <= 0) return 0;
            int length = str.Length;
            int b = index < 0 ? length - (index % length) : index;
            return b % length;
        }

        static bool nearby(char who, string where, int near)
        {
            return (where[I(where,near+1)] == who || where[I(where, near - 1)] == who);
        }
        
        static bool near_left(string b,int j,string a, int i)
        {
            return nearby(b[I(b, j - 1)], a, i);
        }

        static bool near_right(string b, int j, string a, int i)
        {
            return nearby(b[I(b, j + 1)], a, i);
        }

        static int makeAnagram(string a, string b)
        {

            int a_l = a.Length;
            int b_l = b.Length;
            bool near = false;
            for (int j = 0; j < b_l; j++) //позиция буквы в строке `b`
            {
                char s = b[j];//берем из `b` одну букву
                List<int> searched = new List<int>();
                for (int i = 0; i < a_l; i++)
                {
                    if (a[i] == s) searched.Add(i); //и ищем эту букву в `a`
                }
                if (searched.Count > 0)
                {
                    
                    foreach (int i in searched) // индекс найденноой буквы в строке `a`
                    {
                        if (near_left(b, j, a, i))
                        {
                            near = true;Console.WriteLine("Founded Left");}
                        if (near_right(b, j, a, i))
                        {
                            near = true;Console.WriteLine("Founded Right");}
                    }

                    Console.WriteLine();
                }
            }

            return -1;
        }
        static void Main(string[] args)
        {
            
            Console.WriteLine(makeAnagram("fcrxzwscanmligyxyvym", "jxwtrhvujlmrpdoqbisbwhmgpmeoke"));
            Console.ReadLine();
        }
    }
}