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How to find an element that appears once in an array of elements that appears three times in VB.NET

1 Answer

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Imports System
Imports System.Collections.Generic

Public Class FindElementThatAppearsOnceInArray_VB
    Public Shared Function FindElementThatAppearsOnceInArray(ByVal arr As Integer()) As Integer
        Dim map As Dictionary(Of Integer, Integer) = New Dictionary(Of Integer, Integer)()

        For Each x As Integer In arr
            If map.ContainsKey(x) Then
                map(x) += 1
                map(x) = 1
            End If

        For Each entry As KeyValuePair(Of Integer, Integer) In map
            If entry.Value = 1 Then
                Return entry.Key
            End If

        Return -1
    End Function

    Public Shared Sub Main(ByVal args As String())
        Dim arr As Integer() = New Integer() {3, 5, 5, 2, 7, 3, 2, 8, 8, 3, 2, 5, 8}

    End Sub
End Class

' run:
' 7


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answered Jul 8 by avibootz