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Class: PuzzleSolvers.BattlefieldUniquenessConstraint

Summary

Describes a “battlefield” constraint: the first and last number in the region represent the sizes of two armies, who march inward; the clue specifies the sum of the digits that are sandwiched between the armies or that are within the armies’ overlap. This constraint implies a uniqueness constraint.

Remarks

Warning: This constraint is very memory-intensive. It is implemented as a CombinationsConstraint with all of the possible number combinations for the specified set of cells. Avoid using this on oversized puzzles. (At time of writing, this is only feasible for up to 11 cells, which uses about 2 GB of RAM for each constraint.)

Constructors

BattlefieldUniquenessConstraint(int clue, IEnumerable<int> affectedCells, int minValue = 1, int maxValue = 9)
 Describes a “battlefield” constraint: the first and last number in the region represent the sizes of two armies, who march inward; the clue specifies the sum of the digits that are sandwiched between the armies or that are within the armies’ overlap. This constraint implies a uniqueness constraint. (see also remarks)

Static methods

int
CalculateBattlefieldClue(int[] values)
Calculates what the Battlefield clue would be for a given row of numbers.
int[][]
GenerateCombinations(int minValue, int maxValue, int clue, int numAffectedCells)
 Generates (and caches) all possible combinations of digits that satisfy a given Battlefield clue.

Instance methods

ConstraintResult
Process(SolverState state)
Refer to the documentation for Constraint.Process.
string
ToString()
Override.

Instance properties

int
Clue
The sum of the digits sandwiched or overlapped.