Which is faster, Hash lookup or Binary search?

Question

When given a static set of objects (static in the sense that once loaded it seldom if ever changes) into which repeated concurrent lookups are needed with optimal performanc

Answer 1

Here it's described how hashes are built and because the Universe of keys is reasonably big and hash functions are built to be "very injective" so that collisions rarely happen the access time for a hash table is not O(1) actually ... it's something based on some probabilities. But,it is reasonable to say that the access time of a hash is almost always less than the time O(log_2(n))