Question

How to find the element that appears once in array where other elements appear in pairs with VB.NET

Answer 1

Imports System

Public Class Program
	Public Shared Function findElementThatAppearsOnce(ByVal arr As Integer()) As Integer
        Dim size As Integer = arr.Length
        Dim element As Integer = arr(0)

        For i As Integer = 1 To size - 1
            element = element Xor arr(i)
        Next

        Return element
    End Function

    Public Shared Sub Main()
        Dim arr As Integer() = {7, 2, 2, 4, 5, 3, 4, 5, 7}
	
        Console.Write(findElementThatAppearsOnce(arr))
    End Sub
End Class




' run
'
' 3
' 

 

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