def fwd.cols
import bend-parallel@0.1.0.0/sort.bend as Sortimport Base
import bend-parallel@0.1.0.0/histogram.bend as Hist
257# Columns c to c + n.
258def fwd.cols(+n: Nat, +c: U32, +k: U32, +kb: Nat, +nb: Nat, p: Hist.Two) -> Hist.Two:
259 match n:
260 case 0n:
261 fwd.one(U32.is_lt(c, k), c, kb, nb, p)
262 case 1n+q:
263 fwd.cols(q, (c + 1 : U32), k, kb, nb, fwd.one(U32.is_lt(c, k), c, kb, nb, p))