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Rollup merge of #106933 - schuelermine:fix/doc/102451, r=Amanieu

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Update documentation of select_nth_unstable and select_nth_unstable_by to state O(n^2) complexity

See #102451
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Dylan DPC 2023-02-19 13:03:40 +05:30 • committed by GitHub
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20
library/core/src/slice/mod.rs
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@ -2730,8 +2730,10 @@ impl<T> [T] {
/// This reordering has the additional property that any value at position `i < index` will be
/// less than or equal to any value at a position `j > index`. Additionally, this reordering is
/// unstable (i.e. any number of equal elements may end up at position `index`), in-place
/// (i.e. does not allocate), and *O*(*n*) worst-case. This function is also/ known as "kth
/// element" in other libraries. It returns a triplet of the following from the reordered slice:
/// (i.e. does not allocate), and *O*(*n*) on average. The worst-case performance is *O*(*n* log *n*).
/// This function is also known as "kth element" in other libraries.
///
/// It returns a triplet of the following from the reordered slice:
/// the subslice prior to `index`, the element at `index`, and the subslice after `index`;
/// accordingly, the values in those two subslices will respectively all be less-than-or-equal-to
/// and greater-than-or-equal-to the value of the element at `index`.
@ -2777,8 +2779,11 @@ impl<T> [T] {
/// This reordering has the additional property that any value at position `i < index` will be
/// less than or equal to any value at a position `j > index` using the comparator function.
/// Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) worst-case. This function
/// is also known as "kth element" in other libraries. It returns a triplet of the following from
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) on average.
/// The worst-case performance is *O*(*n* log *n*). This function is also known as
/// "kth element" in other libraries.
///
/// It returns a triplet of the following from
/// the slice reordered according to the provided comparator function: the subslice prior to
/// `index`, the element at `index`, and the subslice after `index`; accordingly, the values in
/// those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to
@ -2829,8 +2834,11 @@ impl<T> [T] {
/// This reordering has the additional property that any value at position `i < index` will be
/// less than or equal to any value at a position `j > index` using the key extraction function.
/// Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) worst-case. This function
/// is also known as "kth element" in other libraries. It returns a triplet of the following from
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) on average.
/// The worst-case performance is *O*(*n* log *n*).
/// This function is also known as "kth element" in other libraries.
///
/// It returns a triplet of the following from
/// the slice reordered according to the provided key extraction function: the subslice prior to
/// `index`, the element at `index`, and the subslice after `index`; accordingly, the values in
/// those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to