How can a series of unique random numbers be generated efficiently without any repetitions?

Question

Accepted Answer

Efficiently generating unique random numbers can be achieved using algorithms and data structures that ensure no repetitions occur.

Use a Set: Store generated numbers in a Set to automatically handle duplicates. Example: `Set uniqueNumbers = new HashSet<>();`
Shuffle an Array: Create an array of numbers and shuffle it. Example: `Collections.shuffle(Arrays.asList(numbers));`
Random Sampling: Use random sampling techniques to select numbers from a range without replacement. Example: `Random rand = new Random();`
Reservoir Sampling: For large datasets, use reservoir sampling to maintain a sample of unique numbers efficiently.
Bit Manipulation: Use bit arrays to track which numbers have been generated, allowing for quick checks and insertions.

Top Software Development Engineer II Interview Questions Asked at Zeta