private Node root; //start node
public BranchAndBoundSover(List<Item> items, int capacity) : base(items, capacity)
{
Node.Items = Items;
Node.Capacity = Capacity;
items.Sort(delegate (Item i1, Item i2) { return (i1.Value / i1.Weight).CompareTo(i2.Value / i2.Weight); });
items.Reverse();
addedItems = new int[this.Items.Count];
for (int i = 0; i < addedItems.Length; i++)
{
addedItems[i] = 1;
}
root = new Node(0, 0, 0, addedItems);
branchingNodes = new List<Node>() { root };
}
private void Branch(Node node)
{
branchingNodes.Remove(node);
Node nodeLeft = new Node(node.Index + 1, node.Value + Items[node.Index].Value, node.Weight + Items[node.Index].Weight, (int[])node.AddedItems.Clone());
int[] addedItemsClone = (int[])node.AddedItems.Clone();
addedItemsClone[node.Index] = 0;
Node nodeRight = new Node(node.Index + 1, node.Value, node.Weight, addedItemsClone);
if (nodeLeft.Weight <= this.Capacity)
{
branchingNodes.Add(nodeLeft);
}
if (nodeRight.Weight<=this.Capacity)
{
branchingNodes.Add(nodeRight);
}
}