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89357b2 · Dec 17, 2022

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check-if-n-and-its-double-exist

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Dec 17, 2022

 Check If N and Its Double Exist


Given an array arr of integers, check if there exist two indices i and j such that :

  • i != j
  • 0 <= i, j < arr.length
  • arr[i] == 2 * arr[j]

 

Example 1:

Input: arr = [10,2,5,3]
Output: true
Explanation: For i = 0 and j = 2, arr[i] == 10 == 2 * 5 == 2 * arr[j]

Example 2:

Input: arr = [3,1,7,11]
Output: false
Explanation: There is no i and j that satisfy the conditions.

 

Constraints:

  • 2 <= arr.length <= 500
  • -103 <= arr[i] <= 103