Pointer Trio
`prev`, `curr`, and `next` protect the chain while each link is reversed.
Loading...
Loading...
Loading Curriculum...
Loading Subject...
Loading Topic...
Loading Lesson...
Loading Lab...
Reverse In K Groups rewires node links so traversal order changes without copying the entire list.
`prev`, `curr`, and `next` protect the chain while each link is reversed.
The current node points backward to `prev`, then all pointers advance.
When traversal ends, `prev` becomes the new head.
DLL and k-group reversal use the same pointer discipline with extra boundaries.