public SpiralLayer(SpiralLayer priorLayer)
{
this.Level = priorLayer.Level + 1;
this.points = new List <SpiralPoint>();
var currentX = this.Level;
var currentY = -this.Level + 1;
var previousValue = 0;
while (currentY <= this.Level)
{
var pointValue = priorLayer.GetSumOfPointsNextTo(currentX, currentY) + previousValue;
previousValue = pointValue;
this.points.Add(new SpiralPoint(pointValue, currentX, currentY));
++currentY;
}
previousValue += this.points[this.points.Count - 2].Value;
--currentY;
--currentX;
while (currentX >= -this.Level)
{
var pointValue = priorLayer.GetSumOfPointsNextTo(currentX, currentY) + previousValue;
previousValue = pointValue;
this.points.Add(new SpiralPoint(pointValue, currentX, currentY));
--currentX;
}
previousValue += this.points[this.points.Count - 2].Value;
++currentX;
--currentY;
while (currentY >= -this.Level)
{
var pointValue = priorLayer.GetSumOfPointsNextTo(currentX, currentY) + previousValue;
previousValue = pointValue;
this.points.Add(new SpiralPoint(pointValue, currentX, currentY));
--currentY;
}
previousValue += this.points[this.points.Count - 2].Value;
++currentY;
++currentX;
while (currentX <= this.Level)
{
var pointValue = priorLayer.GetSumOfPointsNextTo(currentX, currentY) + previousValue;
if (this.points[0].IsNextTo(currentX, currentY))
{
pointValue += this.points[0].Value;
}
previousValue = pointValue;
this.points.Add(new SpiralPoint(pointValue, currentX, currentY));
++currentX;
}
}
public string GenerateAnswer(string input)
{
var value = Convert.ToInt32(input);
var currentLevel = SpiralLayer.Initial;
while (currentLevel.Values.Last() <= value)
{
currentLevel = new SpiralLayer(currentLevel);
}
return(currentLevel.Values.Where(it => it > value).Min().ToString());
}
