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 != j0 <= i, j < arr.lengtharr[i] == 2 * arr[j]
Return true if such indices exist, otherwise return false.
Example 1
Input
arr = [10,2,5,3]Output
trueFor i = 0 and j = 2, arr[i] == 10 == 2 * 5 == 2 * arr[j].
Example 2
Input
arr = [3,1,7,11]Output
falseThere is no i and j that satisfy the conditions.
Constraints
- 2 <= arr.length <= 500
- -10^3 <= arr[i] <= 10^3