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27 lines
596 B
Python
27 lines
596 B
Python
"""
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Given an array arr of integers, check if there exist two indices i and j such that :
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i != j
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0 <= i, j < arr.length
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arr[i] == 2 * arr[j]
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"""
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def check_if_exist(arr: list[int]) -> bool:
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aux_dict = {}
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for i, num in enumerate(arr):
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aux_dict[2*num] = i
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for j, num in enumerate(arr):
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if num in aux_dict.keys() and j != aux_dict[num]:
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return (j, aux_dict[num])
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return False
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if __name__ == "__main__":
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arr = [-2, 0, 10, -19, 4, 6, -8]
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print(check_if_exist(arr)) |