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Count combinations with replacement #737

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Merged
merged 8 commits into from
Sep 4, 2023
Merged

Count combinations with replacement #737

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630f78d
Remaining combinations with replacement
Philippe-Cholet Aug 26, 2023
c9b2fdb
`CombinationsWithReplacement::size_hint`
Philippe-Cholet Aug 26, 2023
b9bc9e5
`CombinationsWithReplacement::count`
Philippe-Cholet Aug 26, 2023
a163451
Test `combinations_with_replacement` counts
Philippe-Cholet Aug 26, 2023
9cb3543
Fix debug type name
Philippe-Cholet Aug 26, 2023
dd0e66c
`remaining_for`: add "stars and bars" explanation
Philippe-Cholet Sep 3, 2023
c13ee58
`remaining_for`: handle `n + k - 1` overflowing
Philippe-Cholet Sep 3, 2023
8ce17a9
`remaining_for`: copy/update previous explanation
Philippe-Cholet Sep 3, 2023
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7 changes: 7 additions & 0 deletions src/combinations_with_replacement.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,13 @@ where
None => None,
}
}

fn size_hint(&self) -> (usize, Option<usize>) {
let (mut low, mut upp) = self.pool.size_hint();
low = remaining_for(low, self.first, &self.indices).unwrap_or(usize::MAX);
upp = upp.and_then(|upp| remaining_for(upp, self.first, &self.indices));
(low, upp)
}
}

impl<I> FusedIterator for CombinationsWithReplacement<I>
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