/// <summary>
/// adds the load command immediately to the commands queue,
/// and stores the delivery command for later
/// </summary>
public void LoadForDelivery(Drone d, WareHouse wh, Order o, int item)
{
var load = String.Format("{0} L {1} {2} {3}", d.id, wh.id, item, 1);
var deli = String.Format("{0} D {1} {2} {3}", d.id, o.id, item, 1);
_validatedCommands.AppendLine(load);
_deliveryOrders[d.id].AppendLine(deli);
}
/// <summary>
/// executes the deliver commands stashed for this drone
/// </summary>
public void DoDeliver(Drone d, Order o, bool orderComplete)
{
if (d.turn > o.DeliveryTime)
o.DeliveryTime = d.turn;
_validatedCommands.Append(_deliveryOrders[d.id]);
_deliveryOrders[d.id].Clear();
if (orderComplete)
{
Score += GetScoreForDeliveryOn(o.DeliveryTime-1);
}
}
public static Solution Solve(Input input)
{
_multidroneMalus = 1.0 + Helper.Rand.NextDouble(); //choose a random malus between 1 and 2 for this run
var solution = new Solution(input);
var drones = new Drone[input.NbDrones];
for (int d = 0; d < input.NbDrones; d++)
{
drones[d] = new Drone(input, d);
}
var iteration = 0; //to ease debuging a particular step
while (true)
{
iteration++;
//chooseDrone furthest in the past
Drone chosen = drones[0];
for (int d = 1; d < drones.Length; d++)
{
if (drones[d].turn < chosen.turn)
chosen = drones[d];
}
if (chosen.turn > input.NbTurns)
{
Console.WriteLine("end of times reached");
return solution; //can't do shit anymore
}
//choose order
WareHouse wh;
var order = GetBestOrder(chosen, input, out wh);
if (order == null)
{
return solution; //no more order to deliver
}
if (wh != null)
{
//go to warehouse and load everything
for (int i = 0; i < order.ItemsWanted.Length; i++)
{
var itemType = order.ItemsWanted[i];
if(itemType < 0)
continue;
wh.Stock[itemType]--;
Helper.Assert(() => wh.Stock[itemType] >= 0);
chosen.Load(wh, itemType);
solution.LoadForDelivery(chosen, wh, order, itemType);
}
//everything is loaded
for (int dd = 0; dd < order.NbItemsRemaining; dd++)
{
chosen.Deliver(order);
}
solution.DoDeliver(chosen, order, orderComplete: true);
order.ItemsWanted = null;
}
else //we'll have to go to several warehouses to load stuff OR we'll need several drones
{
var loadedToDeliver = new List<int>();
var itemsToDeliver = (int[]) order.ItemsWanted.Clone();
while(itemsToDeliver.Any(it => it >= 0))
{
//best warehouse with item in stock
double bestScore = Double.PositiveInfinity;
WareHouse bestwh = null;
List<int> availableItems = null;
for (int w = 0; w < input.NbWareHouses; w++)
{
var currentwh = input.WareHouses[w];
var items = currentwh.GetFulfillable(itemsToDeliver);
if (items.Count > 0)
{
var score = (double) Helper.Distance(chosen.X, chosen.Y, currentwh.X, currentwh.Y)/items.Count; //time per item
if (score < bestScore)
{
bestScore = score;
bestwh = currentwh;
availableItems = items;
}
}
}
wh = bestwh;
for (int i = 0; i < availableItems.Count; i++)
{
var itemType = order.ItemsWanted[availableItems[i]];
if (itemType < 0) //already delivered
continue;
if (!chosen.CheckLoad(wh, itemType))
{
//drone passed end of turns or is full
goto deliver; //maybe we could stash one or two more small items, but whatever
}
wh.Stock[itemType]--;
itemsToDeliver[availableItems[i]] = -1;
chosen.Load(wh, itemType);
solution.LoadForDelivery(chosen, wh, order, itemType);
loadedToDeliver.Add(availableItems[i]);
}
}
deliver:
for (int dd = 0; dd < loadedToDeliver.Count; dd++)
{
chosen.Deliver(order);
}
for (int i = 0; i < loadedToDeliver.Count; i++)
{
Helper.Assert(() => order.ItemsWanted[loadedToDeliver[i]] >= 0);
order.TotalWeight -= input.ProductTypes[order.ItemsWanted[loadedToDeliver[i]]];
order.ItemsWanted[loadedToDeliver[i]] = -1; //mark as delivered
order.NbItemsRemaining--;
}
var orderComplete = order.NbItemsRemaining == 0;
if (orderComplete)
{
Helper.Assert(() => order.ItemsWanted.All(it => it < 0));
order.ItemsWanted = null;
}
else
{
Helper.Assert(() => order.ItemsWanted.Any(it => it >= 0));
}
solution.DoDeliver(chosen, order, orderComplete);
}
}
}
private static Order GetBestOrder(Drone d, Input input, out WareHouse goThere)
{
goThere = null;
int bestCost = Int32.MaxValue;
Order best = null;
foreach (var order in input.Orders)
{
if(order.ItemsWanted == null)
continue; //already delivered
int cost = Int32.MaxValue;
WareHouse bestWh = null;
var totalWeight = order.TotalWeight;
if (totalWeight < input.MaxPayload) //one drone can take care of this order
{
var eligibleWareHouses = input.WareHouses.Where(wh => wh.CanFullfillOrder(order.ItemsWanted) == order.NbItemsRemaining);
if (eligibleWareHouses.Any()) //everything is in the same warehouse
{
foreach (var wh in eligibleWareHouses)
{
var dist = Helper.Distance(d.X, d.Y, wh.X, wh.Y) + Helper.Distance(wh.X, wh.Y, order.X, order.Y);
if (dist < cost)
{
cost = dist;
bestWh = wh;
}
}
}
else //one drone can do everything, but has to go to several warehouses
{
//simulate going to 3 different wh
int dist = 0;
var wh = input.WareHouses[Helper.Rand.Next(input.NbWareHouses)];
dist += Helper.Distance(d.X, d.Y, wh.X, wh.Y) * 3;
dist += Helper.Distance(order.X, order.Y, wh.X, wh.Y);
if (dist < cost)
{
cost = dist;
}
}
}
else //we'll need several drones to complete this order
{
//simulate going to 3 different wh
int dist = 0;
var wh = input.WareHouses[Helper.Rand.Next(input.NbWareHouses)];
dist += Helper.Distance(d.X, d.Y, wh.X, wh.Y)*3;
dist += Helper.Distance(order.X, order.Y, wh.X, wh.Y);
dist = (int)(_multidroneMalus * dist * totalWeight/input.MaxPayload); //apply a malus for estimated nb of drones needed
if (dist < cost)
{
cost = dist;
}
}
if (cost < bestCost)
{
bestCost = cost;
best = order;
goThere = bestWh;
}
}
return best;
}