I can work up one. Choosing the right bucket will be O(1) as the index is integer. We can store the buckets for lookup in a hash-table or an array-of-arrays, wh

I can work up one. Choosing the right bucket will be O(1) as the index is integer. We can store the buckets for lookup in a hash-table or an array-of-arrays, which again will be O(1). Reaching to the actual index should again be O(1) - unless am messing something here.