pegGame.frink

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// This Frink program analyzes the peg-jumping board game like the ones found
// at Cracker Barrel.

class PegGame
{
// This encodes the locations we can [jumpTo, over] from a given peg.
class var jumpTable = [[[3,1],[5,2]],  // 0
             [[6,3],[8,4]],  // 1
             [[7,4],[9,5]],  // 2
             [[0,1],[5,4],[10,6],[12,7]], // 3
             [[11,7],[13,8]], // 4
             [[0,2],[3,4],[12,8],[14,9]],  // 5
             [[1,3],[8,7]],   // 6
             [[2,4],[9,8]],   // 7
             [[1,4],[6,7]],   // 8
             [[2,5],[7,8]],   // 9
             [[3,6],[12,11]], // 10
             [[4,7],[13,12]], // 11
             [[3,7],[5,8],[10,11],[14,13]], // 12
             [[4,8],[11,12]], // 13
             [[5,9],[12,13]]] // 14

   // Sets up a board for analysis
   class analyzeBoard[pegs, trackMoves = false] :=
   {
      results = makeArray[[11],0]
      if trackMoves == true
         moves = new array
      else
         moves = undef
      analyzeBoardRecursive[pegs, results, moves]
      sum = sum[results]
      for i = 1 to 10
      {
         r = results@i
         if (r != 0)
            println["$i\t$r\t" + padLeft[format[r/sum*100,1,4],7," "]]
      }
   }

   class analyzeBoardRecursive[pegs, results, currentMove] :=
   {
      //println[pegs]
      movesFound = 0
      pegsLeft = 0
      for from = 0 to 14
      {
         if (pegs@from == true)
         {
            pegsLeft = pegsLeft + 1
            jumps = jumpTable@from
            for [jumpTo, jumpOver] = jumps
               if pegs@jumpTo == false and pegs@jumpOver == true
               {
                  newBoard = pegs.shallowCopy[]
                  newBoard@from = false
                  newBoard@jumpTo = true
                  newBoard@jumpOver = false
                  movesFound = movesFound + 1
                  if currentMove != undef
                  {
                     newMoves = currentMove.shallowCopy[]
                     newMoves.push["$from-$jumpTo"]
                  }
                  analyzeBoardRecursive[newBoard, results, newMoves]
               }
         }
      }

      if (movesFound == 0)
      {
         //println[pegsLeft]
         if pegsLeft == 1
         {
            print["remain:$pegsLeft\t"]
            if (currentMove != undef)
               print[join[" ",currentMove]]
            println["\t$pegs"]
         }
         results@pegsLeft = results@pegsLeft + 1
      }
   }
}
 
pegs = makeArray[[15],true]
// Remove one peg
pegs@0 = false
println["\n(0 initially empty):"]
PegGame.analyzeBoard[pegs, true]

pegs = makeArray[[15],true]
// Remove one peg
pegs@1 = false
println["\n(1 initially empty):"]
PegGame.analyzeBoard[pegs, true]

pegs = makeArray[[15],true]
// Remove one peg
pegs@4 = false
println["\n(3 initially empty):"]
PegGame.analyzeBoard[pegs, true]

pegs = makeArray[[15],true]
// Remove one peg
pegs@3 = false
println["\n(4 initially empty):"]
PegGame.analyzeBoard[pegs, true]

            


Download or view pegGame.frink in plain text format

This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 19966 days, 11 hours, 58 minutes ago.