99 lines
2.3 KiB
Nim
99 lines
2.3 KiB
Nim
import math, options, sequtils, random, sets
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import combinators, game, fixedseq
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type
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ScoreSet* = array[Color, int]
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LegResults* = tuple[scores: ScoreSet, endStates: HashSet[Board]]
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proc update*(scores: var ScoreSet, toAdd: ScoreSet) =
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for i, s in toAdd:
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scores[i] += s
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proc projectLeg(b: Board): LegResults =
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var scores: ScoreSet
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var endStates: HashSet[Board]
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var diceRemaining: ColorStack
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diceRemaining.initFixedSeq
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for i, c in b.diceRolled:
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if not c: diceRemaining.add(i)
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for future in possibleFutures(diceRemaining):
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var prediction = b # make a copy
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for dieRoll in future:
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prediction.advance(dieRoll)
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inc scores[prediction.leader.get]
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# deduplicate results
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endStates.incl(prediction)
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result = (scores, endStates)
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proc projectOutcomes(b: Board, maxDepth = 1): ScoreSet =
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var outcomeStack = @[ [b].toHashSet ]
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for depth in 1..maxDepth:
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echo "simulating ", outcomeStack[^1].len, " possible legs."
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var endStates: HashSet[Board]
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for o in outcomeStack[^1]:
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var o = o # make it mutable
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if outcomeStack.len > 1:
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o.resetDice # o was describina an end-of-leg state, so dice were exhausted
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let projection = o.projectLeg
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result.update(projection[0])
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endStates.incl(projection[1])
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stdout.write("simulated: " & $result.sum & "\r")
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outcomeStack.add(endStates)
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echo "\nDistinct end states: ", outcomeStack.mapIt(it.len).sum
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proc randomGame(b: Board, r: var Rand): Color =
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var projection = b
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while true:
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for roll in randomFuture(projection.diceRemaining, r):
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projection.advance(roll)
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if projection.gameOver:
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return projection.leader.get
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projection.resetDice
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proc randomGames(b: Board, count: SomeInteger): ScoreSet =
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randomize()
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var r = initRand(rand(int64))
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for i in 0 ..< count:
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let winner = b.randomGame(r)
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inc result[winner]
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if i mod 100_000 == 0:
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stdout.write("simulated: " & $i & "\r")
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echo ""
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var b: Board
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b.init
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b.display(1, 5)
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b.setState({cGreen: 4, cYellow: 3, cPurple: 4, cBlue: 3, cRed: 5}, @[])
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b.display(1, 5)
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# b.advance((cRed, 1))
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# b.display(1, 5)
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# var s: ColorStack
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# s.initFixedSeq
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# for i in 0..4:
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# s.add(Color(i))
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# echo s
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# echo s[2]
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let r = b.randomGames(10_000_000)
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let total = r.sum
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for i, c in r:
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echo Color(i), ": ", (100 * c / total).round(2), "% (", c, " / ", total, ")"
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