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 void SolveQuestion(QuestionNumber questionNumber)
{
_chapters[questionNumber.Chapter - 1].SolveQuestion(questionNumber);
}
