//Meが動くとする。「Meのスコア - Enemyのスコア」の最大値を返す。
private int NegaMax(int deepness, SearchState state, int alpha, int beta, int count, PointEvaluator.Base evaluator)
{
var sw = System.Diagnostics.Stopwatch.StartNew();
if (deepness == 0)
{
return(evaluator.Calculate(ScoreBoard, state.MeBoard, 0, state.Me, state.Enemy) - evaluator.Calculate(ScoreBoard, state.EnemyBoard, 0, state.Enemy, state.Me));
}
Ways ways = state.MakeMoves(AgentsCount, ScoreBoard);
int i = 0;
foreach (var way in ways.GetEnumerator(AgentsCount))
{
i++;
if (CancellationToken.IsCancellationRequested == true)
{
return(alpha);
} //何を返しても良いのでとにかく返す
SearchState backup = state;
state = state.GetNextState(AgentsCount, way);
state = state.ChangeTurn();
int res = -NegaMax(deepness - 1, state, -beta, -alpha, count + 1, evaluator);
if (alpha < res)
{
alpha = res;
dp[count].UpdateScore(alpha, way);
if (alpha >= beta)
{
return(beta); //βcut
}
}
state = backup;
}
sw.Stop();
Log("NODES : {0} nodes, elasped {1} ", i, sw.Elapsed);
ways.End();
return(alpha);
}
//Meが動くとする。「Meのスコア - Enemyのスコア」の最大値を返す。
private int NegaMax(int deepness, SearchState state, int alpha, int beta, int count, PointEvaluator.Base evaluator, Decision ngMove, int greedyDepth)
{
if (deepness == 0)
{
//for (int j = 0; j < greedyDepth; j++)
//{
//Unsafe8Array<VelocityPoint> move = state.MakeGreedyMove(ScoreBoard, WayEnumerator, AgentsCount);
//state.Move(move, AgentsCount);
//Ways moves = state.MakeMoves(AgentsCount, ScoreBoard);
//SortMoves(ScoreBoard, state, moves, 49, null);
//state.Move(moves[0].Agent1Way, moves[1].Agent2Way);
//}
int score = evaluator.Calculate(ScoreBoard, state.MeBoard, 0, state.Me, state.Enemy) - evaluator.Calculate(ScoreBoard, state.EnemyBoard, 0, state.Enemy, state.Me);
if (greedyDepth % 2 == 1)
{
return(-score);
}
return(score);
}
Ways ways = state.MakeMoves(AgentsCount, ScoreBoard);
SmallWays sways = new SmallWays(AgentsCount);
//ways => sways
foreach (var way in ways.GetEnumerator(AgentsCount))
{
sways.Add(new SmallWay(way));
}
SortMoves(ScoreBoard, state, sways, count, ngMove);
for (int i = 0; i < sways.Count; ++i)
{
if (CancellationToken.IsCancellationRequested == true)
{
return(alpha);
} //何を返しても良いのでとにかく返す
//if (count == 0 && !(ngMove is null) && new Decided(ways[i].Agent1Way, ways[i].Agent2Way).Equals(ngMove)) { continue; } //競合手を避ける場合
if (count == 0 && !(ngMove is null)) //2人とも競合手とは違う手を指す
{
int j;
for (j = 0; j < AgentsCount; ++j)
{
if (sways[i].Equals(ngMove.Agents[j]))
{
break;
}
}
if (j != AgentsCount)
{
continue;
}
}
SearchState nextState = state;
nextState = nextState.GetNextState(AgentsCount, sways[i].AgentsWay);
nextState = nextState.ChangeTurn();
int res = -NegaMax(deepness - 1, nextState, -beta, -alpha, count + 1, evaluator, ngMove, greedyDepth);
if (alpha < res)
{
alpha = res;
if (ngMove is null)
{
dp1[count].UpdateScore(alpha, sways[i].AgentsWay);
}
else
{
dp2[count].UpdateScore(alpha, sways[i].AgentsWay);
}
if (alpha >= beta)
{
return(beta); //βcut
}
}
}
sways.Erase();
//WaysPool.Return(ways);
return(alpha);
}