is
fun isSolvable(puzzleState: ArrayList<Int>, blankTileMarker: Int): Boolean
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Checks if the shuffled puzzle grid is solvable.
A puzzle grid is solvable if and only if the number of inversions in the puzzle state is even.
Return
true if the shuffled puzzle grid is solvable; false, otherwise.
Parameters
puzzleState
Current puzzle state (flattened into one dimension, following row-major order).
blankTileMarker
Indicator that the tile is blank.