// Solve button \\
private void solveButton_Click(object sender, EventArgs e)
{
outputDataGrid.Rows.Clear();
solver.weightLimit = int.Parse(weightUpDown.Text);
ProfitTestState maxState = solver.solve();
// Display maxState
foreach (Item item in maxState.subItems)
{
outputDataGrid.Rows.Add(item.name, item.profit);
}
outputDataGrid.Rows.Add();
outputDataGrid.Rows.Add("Total:", maxState.overallProfit);
}
// Solve() returns the max ProfitTestState as the solution.
public ProfitTestState solve()
{
// Create f sub j matrix.
profitMatrix = new ProfitTestState[items.Count, weightLimit + 1];
for (int i = 0; i < items.Count; i++)
{
Item item = items[i];
for (int j = 0; j <= weightLimit; j++)
{
if (item.weight <= j + 1 && item.weight != 0)
{
int numberOfItems = j / item.weight;
ProfitTestState pItem = new ProfitTestState();
pItem.overallProfit = numberOfItems * item.profit;
for (int p = 0; p < numberOfItems; p++)
{
pItem.subItems.Add(item);
}
profitMatrix[i, j] = pItem;
}
else
{
// Assign an empty one so we don't have null collisions.
profitMatrix[i, j] = new ProfitTestState();
}
}
}
// Find max of d and m matrix.
double max = double.MinValue;
ProfitTestState maxProfitTestState = new ProfitTestState();
for (int j = 0; j < items.Count; j++)
{
for (int u = 0; u <= weightLimit; u++)
{
ProfitTestState state = maxForJandU(j + 1, u + 1);
if (state.overallProfit > max)
{
max = state.overallProfit;
maxProfitTestState = state;
}
}
}
return(maxProfitTestState);
}
// Recursive method that returns a combination from j and u.
private ProfitTestState maxForJandU(int j, int u)
{
if (j == items.Count)
{
return(profitMatrix[j - 1, u - 1]);
}
else
{
ProfitTestState maxState = new ProfitTestState();
for (int x = 0; x < u; x++)
{
// Recursive forumla.
ProfitTestState currentState = profitMatrix[j - 1, x];
ProfitTestState currentMaxState = maxForJandU(j + 1, u - x);
if (currentMaxState.overallProfit == 0)
{
currentMaxState.subItems = new List <Item>();
}
double value = currentState.overallProfit + currentMaxState.overallProfit;
if (value > maxState.overallProfit)
{
maxState = new ProfitTestState();
maxState.overallProfit = value;
maxState.subItems = new List <Item>(currentMaxState.subItems);
foreach (Item item in currentState.subItems)
{
maxState.subItems.Add(item);
}
}
}
return(maxState);
}
}
