- Check If N and Its Double Exist
Easy
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