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fix Dsu::leader to avoid multiple assert checks #175

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Merged
merged 1 commit into from
May 24, 2025
Merged

fix Dsu::leader to avoid multiple assert checks #175

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14 changes: 9 additions & 5 deletions src/dsu.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -134,11 +134,7 @@ impl Dsu {
/// - $O(\alpha(n))$ amortized
pub fn leader(&mut self, a: usize) -> usize {
assert!(a < self.n);
if self.parent_or_size[a] < 0 {
return a;
}
self.parent_or_size[a] = self.leader(self.parent_or_size[a] as usize) as i32;
self.parent_or_size[a] as usize
self._leader(a)
}

/// Returns the size of the connected component that contains the vertex $a$.
Expand Down Expand Up @@ -186,6 +182,14 @@ impl Dsu {
.filter(|x| !x.is_empty())
.collect::<Vec<Vec<usize>>>()
}

fn _leader(&mut self, a: usize) -> usize {
if self.parent_or_size[a] < 0 {
return a;
}
self.parent_or_size[a] = self._leader(self.parent_or_size[a] as usize) as i32;
self.parent_or_size[a] as usize
}
}

#[cfg(test)]
Expand Down