dearblue 3db11cef09 Integrate Array#{permutation,combination} into Array#__combination ...

Compared to a pure Ruby implementation, this results in faster performance, eliminates recursive calls, and removes the creation of intermediate objects.

The "permutation" implementation in `ary_combination_next()` is slow for C.
However, it does not require a heap other than the index array.

2026-05-06 18:27:16 +09:00

..

array.rb

Integrate Array#{permutation,combination} into Array#__combination

2026-05-06 18:27:16 +09:00