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12 lines
290 B
Python
12 lines
290 B
Python
from typing import List, Optional
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def two_sum(nums: List, target: int) -> Optional[List[int]]:
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seen = {}
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for i, num in enumerate(nums):
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complement = target - num
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if complement in seen:
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return [seen[complement], i]
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seen[num] = i
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return None
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