internal void Merge(StackOfBoxes other)
{
foreach (var box in other.boxes)
{
AddTop(box);
}
}
private StackOfBoxes BuildMaxHeightStackRecurse(
List <Box> boxes, int index, Dictionary <int, StackOfBoxes> maxStackMap)
{
if (maxStackMap.ContainsKey(index))
{
return(maxStackMap[index]);
}
StackOfBoxes stackWithBottomIndex = new StackOfBoxes();
stackWithBottomIndex.AddBottom(boxes[index]);
StackOfBoxes tallestStackWithBottomIndex = stackWithBottomIndex.Clone();
for (int i = index + 1; i < boxes.Count; i++)
{
var currentStack = stackWithBottomIndex.Clone();
if (boxes[i] < boxes[index])
{
var aboveStack = BuildMaxHeightStackRecurse(boxes, i, maxStackMap);
currentStack.Merge(aboveStack);
if (tallestStackWithBottomIndex < currentStack)
{
tallestStackWithBottomIndex = currentStack;
}
}
}
maxStackMap[index] = tallestStackWithBottomIndex;
return(tallestStackWithBottomIndex);
}
public StackOfBoxes Clone()
{
StackOfBoxes clone = new StackOfBoxes();
foreach (Box box in boxes)
{
clone.AddTop(box);
}
return(clone);
}
public StackOfBoxes BuildMaxHeightStack(List <Box> boxes)
{
boxes.Sort();
boxes.Print();
// Map from bottom index to max height stack of boxes
Dictionary <int, StackOfBoxes> maxStackMap = new Dictionary <int, StackOfBoxes>();
StackOfBoxes tallestStack = new StackOfBoxes();
for (int i = 0; i < boxes.Count; i++)
{
var currentTallestStack = BuildMaxHeightStackRecurse(boxes, i, maxStackMap);
if (tallestStack < currentTallestStack)
{
tallestStack = currentTallestStack;
}
}
return(tallestStack);
}
