2022 rust day 15
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@ -50,7 +50,7 @@ fn ranges_for_row(ranges: &HashMap<(isize, isize), usize>, row: isize) -> impl I
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}
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fn merge_ranges(mut ranges: Vec<Range>) -> Vec<Range> {
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ranges.sort_by(|r1, r2| r1.start().cmp(&r2.start()));
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ranges.sort_unstable_by(|r1, r2| r1.start().cmp(&r2.start()));
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let mut ranges = ranges.into_iter();
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ranges.next()
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.map(|first| ranges
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