public void WhenThereAreTwoRails_ThenTheSequenceIsGeneratedCorrectly(int[] validSequence)
{
var railSelector = new RailSelector(2, validSequence.Length);
var position = 0;
foreach (var rail in railSelector.NextRail())
{
rail.Should().Be(validSequence[position]);
position++;
}
}
public void ConfirmRailSelection(int numRails, int[] expectedSequence)
{
var railSelector = new RailSelector(numRails, expectedSequence.Length);
var idx=0;
foreach(var nextRail in railSelector.NextRail())
{
Assert.That(nextRail, Is.EqualTo(expectedSequence[idx]), string.Format("Rails:{0} Pos:{1}", numRails, idx));
idx++;
}
}
public string Convert(string s, int numRows)
{
var rows = new List<string>();
for(var rail=0; rail < numRows; ++rail)
{
rows.Add(string.Empty);
}
var railSelector = new RailSelector(numRows, s.Length);
var idx = 0;
foreach(var nextRail in railSelector.NextRail())
{
rows[nextRail-1] += s[idx];
idx++;
}
var builder = new StringBuilder();
foreach(var railText in rows)
{
builder.Append(railText);
}
return builder.ToString();
}
