In Python, written with a O(n) solution with the given assumptions using a dictionary and enumeration to generate an index.
def twoSum(arr: list, target: int) -> (int, int): num_dict = dict() for index, num in enumerate(arr): diff = target - num if diff in num_dict: return (min(index, num_dict[diff]), max(index, num_dict[diff])) num_dict[num] = index raise IndexError
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In Python, written with a O(n) solution with the given assumptions using a dictionary and enumeration to generate an index.