private static GameStateInternal GetNextState(GameStateInternal lastState, GameStateInternal initialState)
{
var currentState = lastState;
while (currentState.PreviousState != initialState)
{
currentState = currentState.PreviousState;
}
return(currentState);
}
public GameStateInternal(int tickNumber, PlayerInternal me, PlayerInternal[] enemies, BonusInfo[] bonuses, GameStateInternal previousState, int[,] dangerousMap)
{
_dangerousMap = dangerousMap;
TickNumber = tickNumber;
Me = me;
Enemies = enemies;
Bonuses = bonuses;
PreviousState = previousState;
}
public GameStateInternal FindBestState(GameStateInternal initialState)
{
int depth;
if (initialState.Enemies.Length == 0)
{
depth = 1;
}
else
{
int stepsLeft = initialState.Me.GetPathLengthForTime(Constants.MaxTickCount - initialState.TickNumber);
depth = stepsLeft == 0 ? 1 : Math.Min(_depth, stepsLeft);
}
var simulationQueue = new Queue <(GameStateInternal State, int Depth)>();
simulationQueue.Enqueue((initialState, 0));
int startTickNumber = initialState.TickNumber;
GameStateInternal bestState = null;
int bestScore = Int32.MinValue;
while (simulationQueue.Count > 0)
{
(var currentState, int currentDepth) = simulationQueue.Dequeue();
foreach (var move in EnumValues.GetAll <Move>())
{
var nextState = _simulator.Simulate(currentState, currentState.TickNumber - startTickNumber, move);
if (nextState == null)
{
continue;
}
if (currentDepth == depth - 1)
{
int score = _scorer.Score(nextState);
if (score > bestScore)
{
bestScore = score;
bestState = nextState;
}
}
else
{
simulationQueue.Enqueue((nextState, currentDepth + 1));
}
}
}
return(bestState);
}
public int Score(GameStateInternal state)
{
#if DEBUG
GameDebugData.Current.ScoringsCount++;
#endif
if (state.Me == null)
{
return(-1000);
}
if (state.Me.Direction == null)
{
return(-800);
}
const int scoresMultiplicator = 10;
if (state.Me.Tail.Length == 0)
{
if (state.Me.Territory.Count == GameParams.MapSize.Width * GameParams.MapSize.Height)
{
return(state.Me.Score * scoresMultiplicator);
}
int pathToOutsideLength = PathFinder.GetShortestPathToOutsideLength(state.Me.Position, state.Me.Direction.Value, state.Me.Territory);
int pathToOutsidePenalty = 1 - pathToOutsideLength;
return(state.Me.Score * scoresMultiplicator + pathToOutsidePenalty);
}
if (state.Me.PathToHome == null)
{
return(-900);
}
if (state.Me.GetTimeForPath(state.Me.PathToHome.Length) >= Constants.MaxTickCount - state.TickNumber)
{
return(-500);
}
int potentialScore = CalcPotentialTerritoryCaptureScore(state);
int potentialScoreBonus = (int)(potentialScore * 0.9);
int bonusScore = state.Me.NitroStepsLeft > state.Me.SlowdownStepsLeft
? NitroInScores
: state.Me.SlowdownStepsLeft > state.Me.NitroStepsLeft
? SlowdownInScores
: 0;
return((state.Me.Score + potentialScoreBonus + bonusScore) * scoresMultiplicator);
}
private static List <GameStateInternal> GetStates(GameStateInternal lastState, GameStateInternal initialState)
{
var states = new List <GameStateInternal>();
var currentState = lastState;
while (currentState != initialState)
{
states.Add(currentState);
currentState = currentState.PreviousState;
}
states.Reverse();
return(states);
}
public Direction GetNextDirection(GameState state)
{
#if DEBUG
var stopwatch = new Stopwatch();;
stopwatch.Start();
GameDebugData.Current.Reset();
#endif
if (state.TickNumber == 1)
{
return(GetStartDirection(state));
}
var currentState = _lastState == null
? new GameStateInternal(state)
: new GameStateInternal(state, _lastState);
var bestState = _bestTrajectoryFinder.FindBestState(currentState);
_lastState = currentState;
Direction nextDirection;
if (bestState != null)
{
var nextState = GetNextState(bestState, currentState);
nextDirection = nextState.Me.Direction.Value;
}
else if (currentState.Me.PathToHome != null && currentState.Me.PathToHome.Length > 0)
{
nextDirection = currentState.Me.Position.GetDirectionTo(currentState.Me.PathToHome[0]);
}
else
{
nextDirection = currentState.Me.Direction ?? Direction.Left;
}
#if DEBUG
stopwatch.Stop();
GameDebugData.Current.UsedTime = stopwatch.Elapsed;
GameDebugData.Current.DangerousMap = currentState.DangerousMap;
GameDebugData.Current.BestTrajectory = bestState != null
? GetStates(bestState, currentState).Select(s => s.Me.Position.ConvertToReal(GameParams.CellSize)).ToArray()
: currentState.Me.PathToHome.Select(p => p.ConvertToReal(GameParams.CellSize)).ToArray();
#endif
return(nextDirection);
}
public int CalcPotentialTerritoryCaptureScore(GameStateInternal state)
{
if (state.Me.Tail.Length == 0)
{
return(0);
}
var tailWithPathToHome = new Point[state.Me.Tail.Length + state.Me.PathToHome.Length - 1];
for (int i = 0; i < state.Me.Tail.Length; i++)
{
tailWithPathToHome[i] = state.Me.Tail[i];
}
for (int i = 0; i < state.Me.PathToHome.Length - 1; i++)
{
tailWithPathToHome[state.Me.Tail.Length + i] = state.Me.PathToHome[i];
}
var capturedTerritory = _territoryCapturer.Capture(state.Me.Territory, tailWithPathToHome);
int score = capturedTerritory.Count * Constants.NeutralTerritoryScore;
int enemyTerritoryPoints = 0;
foreach (var point in capturedTerritory)
{
foreach (var enemy in state.Enemies)
{
if (enemy.Territory.Contains(point))
{
enemyTerritoryPoints++;
break;
}
}
}
score += enemyTerritoryPoints * (Constants.EnemyTerritoryScore - Constants.NeutralTerritoryScore);
int nitroCount = 0;
int slowdownCount = 0;
foreach (var bonus in state.Bonuses)
{
if (capturedTerritory.Contains(bonus.Position))
{
switch (bonus.Type)
{
case BonusType.Nitro:
nitroCount++;
break;
case BonusType.Slowdown:
slowdownCount++;
break;
case BonusType.Saw:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
int bonusScore = nitroCount > slowdownCount
? NitroInScores
: slowdownCount > nitroCount
? SlowdownInScores
: 0;
return(score + bonusScore);
}
public GameStateInternal(GameState state, GameStateInternal previousState) : this(state)
{
PreviousState = previousState;
}
public GameStateInternal Simulate(GameStateInternal state, int simulationTicks, Move move)
{
#if DEBUG
GameDebugData.Current.SimulationsCount++;
#endif
int timeToNextPos = GameParams.CellSize / state.Me.GetSpeed(0);
int nextTickNumber = state.TickNumber + timeToNextPos;
var me = (PlayerInternal)state.Me.Clone();
if (me.NitroStepsLeft > 0)
{
me.NitroStepsLeft--;
}
if (me.SlowdownStepsLeft > 0)
{
me.SlowdownStepsLeft--;
}
me.Direction = me.Direction?.GetMoved(move);
if (me.Direction != null)
{
me.Position = me.Position.MoveLogic(me.Direction.Value);
}
if (!GameParams.MapSize.ContainsPoint(me.Position) || // Выехал за пределы карты
me.Tail.Contains(me.Position)) // Наехал сам себе на хвост
{
return(null);
}
var nextBonuses = state.Bonuses;
foreach (var bonus in state.Bonuses)
{
if (bonus.Position == me.Position)
{
switch (bonus.Type)
{
case BonusType.Nitro:
me.NitroStepsLeft += bonus.Steps;
break;
case BonusType.Slowdown:
me.SlowdownStepsLeft += bonus.Steps;
break;
case BonusType.Saw:
break;
default:
throw new ArgumentOutOfRangeException();
}
nextBonuses = state.Bonuses.Where(b => b != bonus).ToArray();
break;
}
}
var enemies = (PlayerInternal[])state.Enemies.Clone();
foreach (var enemy in enemies)
{
if (enemy.Tail.Length == 0 || enemy.Territory.Count == 0)
{
continue;
}
if (enemy.TimeToGetHome > simulationTicks + timeToNextPos)
{
continue;
}
if (enemy.CapturedOnPathToHome != null)
{
if (enemy.TimeToGetHome > simulationTicks)
{
me.Territory = me.Territory.ExceptWith(enemy.CapturedOnPathToHome);
}
continue;
}
var tailWithPathToHome = new Point[enemy.Tail.Length + enemy.PathToHome.Length - 1];
for (int i = 0; i < enemy.Tail.Length; i++)
{
tailWithPathToHome[i] = enemy.Tail[i];
}
for (int i = 0; i < enemy.PathToHome.Length - 1; i++)
{
tailWithPathToHome[enemy.Tail.Length + i] = enemy.PathToHome[i];
}
enemy.CapturedOnPathToHome = _territoryCapturer.Capture(enemy.Territory, tailWithPathToHome);
if (enemy.CapturedOnPathToHome.Contains(state.Me.Position))
{
return(null);
}
me.Territory = me.Territory.ExceptWith(enemy.CapturedOnPathToHome);
}
if (me.Territory.Contains(me.Position))
{
if (me.Tail.Length > 0) // Заезд на свою территорию
{
if (state.DangerousMap[me.Position.X, me.Position.Y] - GameParams.CellSize / GameParams.SlowDownSpeed * 2 < simulationTicks + timeToNextPos) // Упрощенная оценка возможных столкновений
{
if (enemies.Any(enemy => CheckIsCollisionPossible(me, enemy, state.Me.Position, simulationTicks, timeToNextPos))) // Лобовое столкновение с противником
{
return(null);
}
}
var capturedTerritory = _territoryCapturer.Capture(me.Territory, me.Tail);
me.Tail = Path.Empty;
me.Territory = me.Territory.UnionWith(capturedTerritory);
me.Score += capturedTerritory.Count * Constants.NeutralTerritoryScore;
for (int i = 0; i < enemies.Length; i++)
{
var enemy = enemies[i];
int srcCount = enemy.Territory.Count;
var enemyCroppedTerritory = enemy.Territory.ExceptWith(capturedTerritory);
int croppedCount = enemyCroppedTerritory.Count;
if (srcCount != croppedCount)
{
var clonedEnemy = (PlayerInternal)enemy.Clone();
clonedEnemy.Territory = enemyCroppedTerritory;
enemies[i] = clonedEnemy;
me.Score += (srcCount - croppedCount) * (Constants.EnemyTerritoryScore - Constants.NeutralTerritoryScore);
}
}
bool gotBonus = false;
for (int i = 0; i < nextBonuses.Length; i++)
{
var bonus = nextBonuses[i];
if (capturedTerritory.Contains(bonus.Position))
{
switch (bonus.Type)
{
case BonusType.Nitro:
me.NitroStepsLeft += bonus.Steps;
break;
case BonusType.Slowdown:
me.SlowdownStepsLeft += bonus.Steps;
break;
case BonusType.Saw:
break;
default:
throw new ArgumentOutOfRangeException();
}
gotBonus = true;
if (nextBonuses == state.Bonuses)
{
nextBonuses = (BonusInfo[])state.Bonuses.Clone();
}
nextBonuses[i] = null;
}
}
if (gotBonus)
{
nextBonuses = nextBonuses.Where(b => b != null).ToArray();
}
}
}
else
{
me.Tail = me.Tail.Append(me.Position);
if (me.PathToHome == null) // Зашел в тупик
{
return(null);
}
if (me.Tail.Any(p => state.DangerousMap[p.X, p.Y] < simulationTicks + timeToNextPos + me.GetTimeForPath(me.PathToHome.Length))) // Потенциально могут наехать на мой хвост
{
return(null);
}
}
bool hasLosers = false;
for (int i = 0; i < enemies.Length; i++)
{
var enemy = enemies[i];
if (enemy.Tail.AsPointsSet().Contains(me.Position) && enemy.TimeToGetHome > simulationTicks + timeToNextPos + 1) // Противник умирает, только если мы переехали его хвост и он гарантированно не успел вернуться домой
{
hasLosers = true;
enemies[i] = null;
me.Score += Constants.LineKillScore;
break;
}
}
enemies = hasLosers ? enemies.Where(e => e != null).ToArray() : enemies;
return(new GameStateInternal(nextTickNumber, me, enemies, nextBonuses, state, hasLosers ? null : state.DangerousMap));
}