public Cargo Clone() {
Cargo result = new Cargo(this.MaxVolumn, this.MaxWeight);
result.VolumnAvailable = this.VolumnAvailable;
result.WeightAvailable = this.WeightAvailable;
result.Value = this.Value;
result.Items.AddRange(this.Items);
return result;
}
public Tuple<int, int, Cargo> GetMaxValue(Cargo cargo, List<Item> items)
{
Cargo c = cargo.Clone();
int count = (int)(items.Count * Math.Log(items.Count));
foreach (Item i in items.OrderByDescending(i => i.Value / (decimal)(Math.Sqrt(i.Volumn * i.Volumn + i.Weight * i.Weight)))) {
try {
c.AddItem(i);
count++;
} catch { }
}
return new Tuple<int, int, Cargo>(count, 1, c);
}
static void Main(string[] args)
{
Cargo cargo = new Cargo(50, 50);
List<Item> items = new List<Item> {new Item("1", 10, 1, 60), new Item("2", 20, 1, 100), new Item("3", 30, 1, 120) };
Print(cargo, items);
items = new List<Item> {new Item("1", 12, 1, 60), new Item("2", 40, 1, 160), new Item("3", 12, 1, 60), new Item("4", 12, 1, 60) };
Print(cargo, items);
items = new List<Item> { new Item("1", 1, 1, 5), new Item("2", 3, 1, 2), new Item("3", 5, 0, 7), new Item("4", 7, 1, 3), new Item("5", 11, 1, 6) };
cargo = new Cargo(20, 50);
Print(cargo, items);
Console.ReadKey();
}
static void Print(Cargo cargo, List<Item> items)
{
CargoDynamicsProgramming c = new CargoDynamicsProgramming();
CargoGreedy g = new CargoGreedy();
Console.Write($"{cargo}; ");
items.ForEach((i) => { Console.Write($"{i} "); });
Console.WriteLine();
Tuple<int, int, Cargo> t = c.GetMaxValue(cargo, items);
Console.Write($"{t.Item1}: {t.Item2}: {t.Item3.Value}; ");
t.Item3.Items.ForEach((i) => { Console.Write($"{i} "); });
Console.WriteLine();
t = g.GetMaxValue(cargo, items);
Console.Write($"{t.Item1}: {t.Item2}: {t.Item3.Value}; ");
t.Item3.Items.ForEach((i) => { Console.Write($"{i} "); });
Console.WriteLine();
}
// Greedy Alorithm
// MaxValue(i, w, v) = MAX( MaxValue(i-1, w, v),
// I(i).Valve + MAX( MaxValue(i-1, w - I(i).w, v - I(i).v)
protected int mProcess(Cargo cargo, List<Item> items, Dictionary<string, Cargo> mem, int i, double weight, double volumn) {
int count = 0;
string cur = this.mGetLabel(i, weight, volumn);
if (i <= 0 || weight <= 0 || volumn <= 0 || mem.ContainsKey(cur))
return count;
count++;
Item item = items[i - 1];
bool couldLoad = weight >= item.Weight && volumn >= item.Volumn;
if (couldLoad)
count += this.mProcess(cargo, items, mem, i - 1, weight - item.Weight, volumn - item.Volumn);
count += this.mProcess(cargo, items, mem, i - 1, weight, volumn);
decimal value = (couldLoad)? item.Value + this.mGetMem(cargo, mem, i - 1, weight - item.Weight, volumn - item.Volumn).Value: 0;
if ((!couldLoad) || value <= this.mGetMem(cargo, mem, i - 1, weight, volumn).Value) {
mem[cur] = this.mGetMem(cargo, mem, i - 1, weight, volumn);
return count;
}
mem[cur] = this.mGetMem(cargo, mem, i - 1, weight - item.Weight, volumn - item.Volumn).Clone();
mem[cur].AddItem(item);
return count;
}
// Dynamics Programming
// MaxValue =
public Tuple<int, int, Cargo> GetMaxValue(Cargo cargo, List<Item> items) {
Dictionary<string, Cargo> mem = new Dictionary<string, Cargo>();
int count = this.mProcess(cargo, items, mem, items.Count, cargo.MaxWeight, cargo.MaxVolumn);
return new Tuple<int, int, Cargo>(count, mem.Count, this.mGetMem(cargo, mem, items.Count, cargo.MaxWeight, cargo.MaxVolumn));
}
protected Cargo mGetMem(Cargo cargo, Dictionary<string, Cargo> mem, int i, double weight, double volumn) =>
(i <= 0 || weight <= 0 || volumn <= 0) ? cargo : mem[this.mGetLabel(i, weight, volumn)];
