Refactor to use filter_map
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@ -31,8 +31,7 @@ pub const PUZZLE: Puzzle<(usize, Vec<HashSet<usize>>), 2> = Puzzle {
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.map(|row| {
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row.into_iter()
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.enumerate()
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.filter(|(_, b)| *b)
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.map(|(i, _)| i)
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.filter_map(|(i, b)| if b { Some(i) } else { None })
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.collect()
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})
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.collect()
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