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Path halving -> Path compression

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wborgeaud 2021-07-02 15:44:50 +02:00
parent b7561c31a2
commit 083d841397
1 changed files with 7 additions and 6 deletions
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13
src/permutation_argument.rs
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@ -45,14 +45,15 @@ impl<T: Debug + Copy + Eq + PartialEq + Hash, F: Fn(T) -> usize> TargetPartition
}); });
} }
/// Path halving method, see https://en.wikipedia.org/wiki/Disjoint-set_data_structure#Finding_set_representatives. /// Path compression method, see https://en.wikipedia.org/wiki/Disjoint-set_data_structure#Finding_set_representatives.
pub fn find(&mut self, mut x: ForestNode<T>) -> ForestNode<T> { pub fn find(&mut self, mut x: ForestNode<T>) -> ForestNode<T> {
while x.parent != x.index { if x.parent != x.index {
let grandparent = self.forest[x.parent].parent; let root = self.find(self.forest[x.parent]);
self.forest[x.index].parent = grandparent; self.forest[x.index].parent = root.index;
x = self.forest[grandparent]; root
} else {
x
} }
x
} }
/// Merge two sets. /// Merge two sets.