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f6ee61d607
Co-authored-by: Merwane Hamadi <merwanehamadi@gmail.com> Co-authored-by: symphony <john.tian31@gmail.com>
20 lines
421 B
Python
20 lines
421 B
Python
# mypy: ignore-errors
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from typing import List, Optional
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def two_sum(nums: List, target: int) -> Optional[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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# Example usage:
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nums = [2, 7, 11, 15]
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target = 9
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result = two_sum(nums, target)
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print(result) # Output: [0, 1]
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