benchmark/agbenchmark/challenges/deprecated/code/d2.1_guided/artifacts_out/sample_code.py


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from typing import List, Optional


def two_sum(nums: List, target: int) -> Optional[List[int]]:
    seen = {}
    for i, num in enumerate(nums):
        complement = target - num
        if complement in seen:
            return [seen[complement], i]
        seen[num] = i
    return None