Package g1301_1400.s1346_check_if_n_and_its_double_exist

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    1346 - Check If N and Its Double Exist\.

    Easy

    Given an array arr of integers, check if there exists two integers N and M such that N is the double of M ( i.e. N = 2 * M).

    More formally check if there exists 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: N = 10 is the double of M = 5,that is, 10 = 2 * 5.

    Example 2:

    Input: arr = 7,1,14,11

    Output: true

    Explanation: N = 14 is the double of M = 7,that is, 14 = 2 * 7.

    Example 3:

    Input: arr = 3,1,7,11

    Output: false

    Explanation: In this case does not exist N and M, such that N = 2 \* M.

    Constraints:

    • 2 <= arr.length <= 500

    • -10^3 <= arr[i] <= 10^3

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Boolean checkIfExist(IntArray arr)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait