Created
December 18, 2022 12:22
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Day17 cycle detect
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| def gridReach(inputGrid: Grid, currentFront: Set[Coord], accuRocksToKeep: Set[Coord]): Set[Coord] = { | |
| if(currentFront.isEmpty) accuRocksToKeep | |
| else { | |
| val neigboursToCheck: Set[Coord] = currentFront.flatMap(c => c.neighbours) | |
| val checkedNeighbours: Set[(Coord, Char)] = neigboursToCheck.map(c => (c,gridGet(inputGrid,c)) match { | |
| case (_, None) => None | |
| case (_, Some('f')) => None | |
| case (_, Some('w')) => None | |
| case (c, Some('.')) => Some((c,'f')) | |
| case (c, Some('#')) => Some((c,'#')) | |
| //case (_, Some('*')) => None | |
| }).filter(_.isDefined).map(_.get) | |
| val newRocksToKeep: Set[Coord] = checkedNeighbours.filter{case(_,i) => i == '#'}.map{case(c,_) => c} | |
| val newFront: Set[Coord] = checkedNeighbours.filter{case(_,i) => i == 'f'}.map{case(c,_) => c} | |
| val gridNewFront: Grid = checkedNeighbours.foldLeft(inputGrid){ case(grid,(coord,char)) => gridUpdateCell(grid,coord,char) } | |
| val gridChangedFrontToWater: Grid = currentFront.foldLeft(gridNewFront) { case(grid, c) => gridUpdateCell(grid, c, 'w') } | |
| gridReach(gridChangedFrontToWater, newFront, accuRocksToKeep ++ newRocksToKeep) | |
| } | |
| } | |
| def removeInvisibleFromBottom: Pit = { | |
| val startFrontCoord: Coord = Coord(0,0) | |
| val gridWithStartFrontSet: Grid = gridUpdateCell(this.grid, Coord(0,0), 'f') | |
| val rocksToKeepCoords = gridReach(gridWithStartFrontSet, Set(startFrontCoord), Set()) | |
| val maxYForNewGrid: Int = if(rocksToKeepCoords.isEmpty) 0 else rocksToKeepCoords.map(_.y).max | |
| val newGrid: Grid = (0 to maxYForNewGrid).toVector.map(y => (0 to gridWidth-1).toVector.map(x => { | |
| if(rocksToKeepCoords contains Coord(y,x)) '#' else '.' | |
| })) | |
| Pit(newGrid, depth, shapes, moves, pushFall, fallingShapeCornerCoord) | |
| } |
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