public IBook CrackingTheCodingInterview(string filename)
{
// 1.1,3.2,14.1
var biggestChapterNumberSoFar = 0;
var solvedQuestions = new HashSet <QuestionNumber>();
using (TextReader reader = File.OpenText(filename))
{
var questions = reader.ReadLine().Split(',');
foreach (var q in questions)
{
string[] question = q.Split('.');
var qn = new QuestionNumber(int.Parse(question[0]), int.Parse(question[1]));
qn.Solved = true;
if (!solvedQuestions.Contains(qn))
{
solvedQuestions.Add(qn);
biggestChapterNumberSoFar = Math.Max(biggestChapterNumberSoFar, qn.Chapter);
}
}
}
if (biggestChapterNumberSoFar < 1)
{
throw new InvalidOperationException("no questions were saved in file.");
}
IBook book = new BookFactory().CrackingTheCodingInterview();
foreach (var solvedQuestion in solvedQuestions)
{
book.SolveQuestion(solvedQuestion);
}
return(book);
}
public static void Main(string[] args)
{
Console.WriteLine($"A sample question number is {new QuestionNumber(2,11)}");
IBookFactory bookFactory = new BookFactory();
var book = bookFactory.CrackingTheCodingInterview();
Console.WriteLine($"created book {book.Name}");
Console.WriteLine($"book {book.Name} has {book.NumChapters} chapters and {book.NumQuestions} questions in total.");
var savedBook = bookFactory.CrackingTheCodingInterview("question-numbers.txt");
Console.WriteLine($"saved book {savedBook.Name} has {savedBook.NumSolved} questions solved.");
var questionsToChooseFrom = new Trainer(savedBook).MakeExamExcludingLastChapters(7);
foreach (var question in questionsToChooseFrom)
{
var stopWatch = new Stopwatch();
stopWatch.Start();
Console.WriteLine($"{DateTime.Now}: Now solve {question}.");
var k = Console.ReadKey();
stopWatch.Stop();
var ts = stopWatch.Elapsed;
string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
ts.Hours, ts.Minutes, ts.Seconds,
ts.Milliseconds / 10);
Console.WriteLine("Runtime: " + elapsedTime);
Console.WriteLine($" Note: update the txt file if you finished {question}.");
if (k.KeyChar.Equals('q'))
{
break;
}
}
}
