private RodCutterResult CutRods(int[] prices, int rodLength, Dictionary <int, RodCutterResult> priorResults)
{
if (rodLength <= 0)
{
return(RodCutterResult.Empty);
}
if (priorResults.ContainsKey(rodLength))
{
return(priorResults[rodLength]);
}
RodCutterResult bestResult = new RodCutterResult();
for (int i = 1; i <= rodLength && i <= prices.Length; i++)
{
var innerResult = CutRods(prices, rodLength - i, priorResults);
if (innerResult.TotalPrice + prices[i - 1] > bestResult.TotalPrice)
{
bestResult.CutLengths.Clear();
bestResult.CutLengths.Add(i);
bestResult.CutLengths.AddRange(innerResult.CutLengths);
bestResult.TotalPrice = prices[i - 1] + innerResult.TotalPrice;
}
}
priorResults.Add(rodLength, bestResult);
return(bestResult);
}
public override RodCutterResult CutRods(int[] prices, int rodLength)
{
if (rodLength <= 0)
{
return(RodCutterResult.Empty);
}
var results = new Dictionary <int, RodCutterResult>();
results.Add(0, RodCutterResult.Empty);
for (int j = 1; j <= rodLength; j++)
{
int maxPrice = Int32.MinValue;
int maxLength = 0;
RodCutterResult maxPriorResult = null;
for (int i = 1; i <= j && i <= prices.Length; i++)
{
int currPrice = prices[i - 1] + results[j - i].TotalPrice;
if (currPrice > maxPrice)
{
maxPrice = currPrice;
maxLength = i;
maxPriorResult = results[j - i];
}
}
var currResult = new RodCutterResult();
currResult.TotalPrice = maxPrice;
currResult.CutLengths.Add(maxLength);
currResult.CutLengths.AddRange(maxPriorResult.CutLengths);
results.Add(j, currResult);
}
return(results[rodLength]);
}
static RodCutterResult()
{
Empty = new RodCutterResult();
}
