However it will happen less often than for a balanced binary tree. This depends on how fully the nodes are packed. Inserting presorted items will tend to maximize the size. Replace for b-tree requires remove then insert. Constant time costs assume that the items are well scattered in the hash slots.
Worst case is linear in the number of items per slot.
Otherwise, requires remove then insert. Does not automatically resize. We recommend that the number of items be between one half and double the number of slots for most uses.