pub struct UnionFind<K> { /* private fields */ }
Expand description

UnionFind<K> is a disjoint-set data structure. It tracks set membership of n elements indexed from 0 to n - 1. The scalar type is K which must be an unsigned integer type.

http://en.wikipedia.org/wiki/Disjoint-set_data_structure

Too awesome not to quote:

“The amortized time per operation is O(α(n)) where α(n) is the inverse of f(x) = A(x, x) with A being the extremely fast-growing Ackermann function.”

Implementations§

source§

impl<K> UnionFind<K>where K: IndexType,

source

pub fn new(n: usize) -> Self

Create a new UnionFind of n disjoint sets.

source

pub fn find(&self, x: K) -> K

Return the representative for x.

Panics if x is out of bounds.

source

pub fn find_mut(&mut self, x: K) -> K

Return the representative for x.

Write back the found representative, flattening the internal datastructure in the process and quicken future lookups.

Panics if x is out of bounds.

source

pub fn equiv(&self, x: K, y: K) -> bool

Returns true if the given elements belong to the same set, and returns false otherwise.

source

pub fn union(&mut self, x: K, y: K) -> bool

Unify the two sets containing x and y.

Return false if the sets were already the same, true if they were unified.

Panics if x or y is out of bounds.

source

pub fn into_labeling(self) -> Vec<K>

Return a vector mapping each element to its representative.

Trait Implementations§

source§

impl<K: Clone> Clone for UnionFind<K>

source§

fn clone(&self) -> UnionFind<K>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<K: Debug> Debug for UnionFind<K>

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

§

impl<K> RefUnwindSafe for UnionFind<K>where K: RefUnwindSafe,

§

impl<K> Send for UnionFind<K>where K: Send,

§

impl<K> Sync for UnionFind<K>where K: Sync,

§

impl<K> Unpin for UnionFind<K>where K: Unpin,

§

impl<K> UnwindSafe for UnionFind<K>where K: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.