challenge-194/aecepoglu/bqn/ch-1.bqn


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all←(∧´24‿60>·(+´10‿1⊸×)¨2⊸↑⋈2⊸↓)˘⊸/>⥊↕4⥊10
n←↕10
'0'-˜(2≠↕5)/x
F←{b←10>d←'0'-˜1‿1‿0‿1‿1/𝕩
   ⌈´⥊(¬b)⊸/˘all/˜(b/d)⊸≡˘b⊸/⌾⍉ all}
2 = F "?3:00"
9 = F "1?:00"
9 = F "1?:00"
5 = F "12:?5"