# project euler 26

# divide a by b, doing one iteration of long division.
# ? b a
Div ← ×10-⊸(×⌊⤚÷)

# we will have to perform long division at most 1000
# times, so just do it 1000 times for all numbers
# below 1000, pervasively.
# use the steps to determine cycle lengths.

1000
⍥⟜⊸Div⟜⊃⇡(↯⊙1) # pervasively repeat long division.
⊢⍖≡(⧻◴)⍉       # cycle length is dedup length.