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49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
"""
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Given an array of integers, return indices of the two numbers such that they add up to
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a specific target.
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You may assume that each input would have exactly one solution, and you may not use the
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same element twice.
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Example:
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Given nums = [2, 7, 11, 15], target = 9,
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Because nums[0] + nums[1] = 2 + 7 = 9,
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return [0, 1].
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"""
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from __future__ import annotations
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def two_sum(nums: list[int], target: int) -> list[int]:
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"""
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>>> two_sum([2, 7, 11, 15], 9)
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[0, 1]
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>>> two_sum([15, 2, 11, 7], 13)
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[1, 2]
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>>> two_sum([2, 7, 11, 15], 17)
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[0, 3]
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>>> two_sum([7, 15, 11, 2], 18)
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[0, 2]
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>>> two_sum([2, 7, 11, 15], 26)
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[2, 3]
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>>> two_sum([2, 7, 11, 15], 8)
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[]
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>>> two_sum([3 * i for i in range(10)], 19)
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[]
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"""
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chk_map: dict[int, int] = {}
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for index, val in enumerate(nums):
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compl = target - val
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if compl in chk_map:
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return [chk_map[compl], index]
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chk_map[val] = index
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return []
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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print(f"{two_sum([2, 7, 11, 15], 9) = }")
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