Generate constrained NFT metadata

Given a set of trait types (e.g., background, eyes, hat), each with a list of allowed values, and a target count N, implement a function to generate N NFT metadata items. Support follow-up constraints such as: (a) no repeated value for a trait within a single NFT; (b) uniqueness of the full trait combination across all generated NFTs; and (c) optional inclusion/exclusion rules between traits. Return the generated items and report when generation is impossible. Describe your data structures, algorithm, complexity, and test strategy.

What a Strong Answer Covers

• A clear algorithm with the right data structures and enough pseudocode or code-level detail to implement it.
• A correctness argument that explains why the algorithm covers all required cases.
• Time and space complexity, plus at least one alternative approach when relevant.
• Focused tests for normal cases, edge cases, and failure modes.

Follow-up Questions

• How would the approach change if the input were streaming or too large for memory?
• What invariants would you assert in production code?
• Which tests would catch off-by-one, duplicate, or tie-breaking bugs?

Solution

Solution Alignment

The prompt asks for an implementation-level answer. The safest way to present it is to define the state, maintain clear invariants, then walk through complexity and tests.

Problem Restatement

Given a set of trait types (e.g., background, eyes, hat), each with a list of allowed values, and a target count N, implement a function to generate N NFT metadata items. Support follow-up constraints such as: (a) no repeated value for a trait within a single NFT; (b) uniqueness of the full trait combination across all generated NFTs; and (c) optional inclusion/exclusion rules between traits. Return the generated items and report when generation is impossible. Describe your data structures, algorithm, complexity, and test strategy.

Recommended Approach

Start with a brute-force baseline to confirm correctness, then identify the repeated work or ordering property that enables a better data structure such as a hash map, heap, stack, queue, two pointers, prefix sums, BFS/DFS, or dynamic programming. Write the implementation around a small invariant and test that invariant directly.

Correctness

The implementation should maintain an invariant after each loop or operation that directly matches the problem statement. At termination, that invariant implies the returned value has considered every valid candidate exactly once, or has preserved the required data-structure state after every API call.

Complexity

State the baseline complexity and the optimized complexity. For most interview constraints, justify why the optimized approach meets the expected input size.

Edge Cases and Tests

Empty and singleton inputs, duplicates, ties, invalid inputs, boundary values, and tests that exercise the main invariant.