Prompt
What is the time complexity of checking `item in s` where `s` is a standard Python `set` containing n elements, on average? A) O(1) B) O(log n) C) O(n) D) O(n log n) Reply with the letter of the correct option (A, B, C, or D).
Expected output
A
| model | score | output |
|---|---|---|
| qwen/qwen3-coder-next | 100% | A |
| moonshotai/kimi-k2.7-code | 100% | A |