Created
May 7, 2017 12:40
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using System; | |
using System.Collections; | |
using System.Collections.Generic; | |
using System.Linq; | |
using System.Text; | |
using System.Threading.Tasks; | |
namespace Csharp.Advanced.StacksAndQueues | |
{ | |
public partial class StacksAndQueues | |
{ | |
public static class _06TruckTour | |
{ | |
private const int DistancePerLitre = 1; | |
public static void Solution() | |
{ | |
var n = int.Parse(Console.ReadLine()); | |
var gasStations = new Queue<GasStation>(); | |
var truck = new Truck(); | |
while (n-- > 0) | |
{ | |
var gasStationParams = Console.ReadLine() | |
.Split() | |
.Select(int.Parse) | |
.ToArray(); | |
var fuel = gasStationParams[0]; | |
var distanceToNextGasStation = gasStationParams[1]; | |
var gasStation = new GasStation(new Pump(fuel), distanceToNextGasStation); | |
gasStations.Enqueue(gasStation); | |
} | |
while (true) | |
{ | |
// current station | |
var current = gasStations.Dequeue(); | |
gasStations.Enqueue(current); | |
// dumps the fuel - returning to 0 | |
// so it can start from another gas station | |
truck.DumpFuel(); | |
int startId = current.Id; | |
// truck is unable to embark on a journey | |
// from current station, skip it | |
if (!current.EntryPoint) | |
continue; | |
truck.GasStop(current); | |
truck.Travel(current); | |
while (truck.Fuel >= 0) | |
{ | |
current = gasStations.Dequeue(); | |
gasStations.Enqueue(current); | |
truck.GasStop(current); | |
truck.Travel(current); | |
// returned to initial gas station | |
// exit successfully | |
if (startId.Equals(current.Id)) | |
{ | |
Console.WriteLine(startId); | |
Environment.Exit(0); | |
} | |
} | |
} | |
} | |
private class GasStation | |
{ | |
private static int _id = 0; | |
public GasStation(Pump pump, int distanceToNextGasStation) | |
{ | |
this.Id = _id++; | |
this.Pump = pump; | |
this.DistanceToNextGasStation = distanceToNextGasStation; | |
this.EntryPoint = pump.Fuel >= distanceToNextGasStation; | |
} | |
public int Id { get; } | |
public Pump Pump { get; } | |
public int DistanceToNextGasStation { get; } | |
public bool EntryPoint { get; } | |
} | |
private class Pump | |
{ | |
public Pump(int fuel) | |
{ | |
this.Fuel = fuel; | |
} | |
public int Fuel { get; } | |
} | |
private class Truck | |
{ | |
public int? Fuel { get; private set; } | |
public void GasStop(GasStation station) | |
{ | |
this.Fuel += station.Pump.Fuel; | |
} | |
public void Travel(GasStation destination) | |
{ | |
this.Fuel -= destination.DistanceToNextGasStation * DistancePerLitre; | |
} | |
public void DumpFuel() | |
{ | |
this.Fuel = 0; | |
} | |
} | |
} | |
} | |
} |
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