public DpInfo CalcDp(State state)
{
if (dp.ContainsKey(state))
{
return dp[state];
}
if (state.Unit.Equals(target) && state.IsLocked)
{
return dp[state] = new DpInfo(0, null, string.Empty, 0);
}
if (state.IsLocked)
{
return dp[state] = new DpInfo(-1, null, string.Empty, 0);
}
if (state.Unit.Equals(target))
{
foreach (var command in Enum.GetValues(typeof(Command)).Cast<Command>())
{
GameUnit nextUnit;
var word = CommandConverter.CovertToAnyChar(command).ToString();
if (!CanMove(state.Unit, word, out nextUnit))
{
return dp[state] = new DpInfo(0, new State(state.Unit, command, true, true, false), word, 0);
}
}
return dp[state] = new DpInfo(-1, null, string.Empty, 0);
}
if (!state.CanGoHorisontal)
{
var best = new DpInfo(-1, null, string.Empty, 0);
dp[state] = best;
foreach (var word in words)
{
GameUnit nextUnit;
if (AvailablePair(state.LastCommand, state.IsLastCommandWord, CommandConverter.Convert(word.First()), word.Length > 1) && CanMove(state.Unit, word, out nextUnit))
{
var nextState = new State(nextUnit, CommandConverter.Convert(word.Last()), false, true, word.Length > 1);
var dpInfo = CalcDp(nextState);
if (dpInfo.Value < 0)
{
continue;
}
var newValue = dpInfo.Value + (word.Length == 1 ? 0 : word.Length);
if (newValue > best.Value || (newValue == best.Value && dpInfo.ExtraMoves < best.ExtraMoves))
{
best = new DpInfo(newValue, nextState, word, dpInfo.ExtraMoves);
}
}
}
return dp[state] = best;
}
var result = CalcDp(new State(state.Unit, state.LastCommand, state.IsLocked, false, state.IsLastCommandWord));
dp[state] = result;
foreach (var horizontalWord in HorizontalWords)
{
//ответ для некоторых элементов компоненты сильной связанности может быть меньше, чем надо. Может еще допилю. Вдруг не критично
GameUnit nextUnit;
if (AvailablePair(state.LastCommand, state.IsLastCommandWord, CommandConverter.Convert(horizontalWord.First()), false) && CanMove(state.Unit, horizontalWord, out nextUnit))
{
var nextState = new State(nextUnit, CommandConverter.Convert(horizontalWord.Last()), false, true, false);
var dpInfo = CalcDp(nextState);
if (dpInfo.Value < 0)
{
continue;
}
var newValue = dpInfo.Value;
if (newValue > result.Value || (newValue == result.Value && dpInfo.ExtraMoves + 1 < result.ExtraMoves))
{
result = new DpInfo(newValue, nextState, horizontalWord, dpInfo.ExtraMoves + 1);
}
}
}
return dp[state] = result;
}
public bool Equals(State other)
{
return Unit.Equals(other.Unit) && LastCommand == other.LastCommand && IsLocked == other.IsLocked && IsLastCommandWord == other.IsLastCommandWord && CanGoHorisontal == other.CanGoHorisontal;
}
public string Generate(Board _board, GameUnit _unit, GameUnit _finishUnit)
{
board = _board;
target = _finishUnit;
moves = new Dictionary<Tuple<GameUnit, string>, GameUnit>();
words = MagicWordsStore.Words.Concat(SpecialWords).OrderByDescending(x => x.Length).ToArray();
dp = new Dictionary<State, DpInfo>();
var state = new State(_unit, Command.Empty, false, true, null);
CalcDp(state);
var stringBuilder = new StringBuilder();
while (!(state.Unit.Equals(target) && state.IsLocked))
{
var dpInfo = dp[state];
stringBuilder.Append(dpInfo.Word);
state = dpInfo.NextState.Value;
}
return stringBuilder.ToString();
}
