def none_among

minebender-game@1.0.0.0 · solver.bend:179

import Base
import minebender-game@1.0.0.0/types.bend as T

179def none_among(+part: T.Grid(Maybe<&2, Bool>), ps: List<&2, T.Pos>) -> Nat:
180  match ps:
181    case Nil{}:
182      0n
183    case q <> t:
184      Nat.add(one_if(is_none(look(part, q))), none_among(part, t))