Find the maximum consecutive repeated value on the bases of two columns - excel

Question

I need the expert help in VBA as I am new. Actually I am looking for Vba code for Consecutive Count on the bases of two column (Serial Number and Alert Code) on button click event. The Column row are not fixed (dynamically change). The Consecutive count is maximum repeat count for Alert Code per Serial number. This should display in output worksheet as per max repeat Alert count per Serial number
Input Worksheet:
Expected Output :
The repeat count work as below pattern from Input sheet (Just for reference only).
Mine source code as below but this does not reference the 1st Column Serial Number (This only work for One column like AlertCode) :
Sub ConsecutiveCount()
Dim lr As Long, c As Range, a As Long
Application.ScreenUpdating = False
lr = Worksheets("Count2").Cells(Rows.Count, 1).End(xlUp).Row
For Each c In Range("B2:B" & lr)
If c.Value <> c.Offset(1).Value Then
a = Cells(c.Row, 3).End(xlUp).Row
' Range(Cells(c.Row, 4), Cells(c.Row, 4).End(xlUp).Offset(1)).Value = c.Row - a
Cells(c.Row, 3).Value = c.Row - a
Else
End If
Next c
Application.ScreenUpdating = True
End Sub
Current Output (Serial number not included)

Answer 1

Screenshot(s) / here(♪) refers:
Named ranges/setup
First, define a couple of named ranges to assist with referencing / formulating in VBA:
Name: range_data: dynamic range that references the two columns of interest (here, col 1&2 in Sheet1):
Refers to: =Sheet1!$D$3:OFFSET(Sheet1!$E$3,COUNTA(Sheet1!$E$3:$E$99995)-1,0,1,1)
Name: range_summary_startcell: a static range that references the desired upper-left cell of the output table / summary.
Refers to: =Sheet1!$G$3
The summary table itself shall comprise a number of rows (depending upon range_data) and 3 columns (given the input/Q) - this will be produced by the macro (code below) and can be seen in screenshot above (G3:I5) - the macro functions shall determine the appropriate dimensions automatically
Code
With these two named ranges (i.e. 'range_data' & 'range_summary_startcell') defined, the following VB code produces the desired output per your Q:
Sub Macro_Summary()
'
'JB_007 07/01/2022
'
'
Application.ScreenUpdating = True
Range("range_summary_startcell").Select
ActiveCell.Formula2R1C1 = "=UNIQUE(range_data)"
ActiveSheet.Calculate
x = ActiveCell.End(xlDown).Row
Set range_count = ActiveCell.Offset(0, 2)
range_count.Select
range_count.Formula2R1C1 = _
"=COUNTIFS(INDEX(range_data,0,2),RC[-1],INDEX(range_data,0,1),RC[-2])"
Selection.AutoFill Destination:=Range(range_count, range_count.Offset(x - range_count.Row))
ActiveSheet.Calculate
End Sub
Caveats: assumes you have Office 365 compatible version of Excel
GIF - Running Macro
Notes (♪) saved as macro-free workbook for your own security if you wish to download underlying workbook - otherwise identical to screenshot(s) in this proposed soln.

Answer 2

Sub ConsecutiveCount()
Dim srcLastRow As Long, cntConsec As Long, i As Long
Dim rng As Range
Dim srcArr() As Variant
Dim srcSht As Worksheet
Dim destsht As Worksheet
Dim destArr() As Variant
Dim combID As String
Dim splitID As Variant
Application.ScreenUpdating = False
Set srcSht = Worksheets("Input")
Set destsht = Worksheets("Output")
With srcSht
srcLastRow = .Cells(.Rows.Count, "A").End(xlUp).Row + 1 ' include 1 blank line
srcArr = .Range(.Cells(2, "A"), .Cells(srcLastRow, "B"))
End With
Dim dict As Object
Dim dKey As Variant
Set dict = CreateObject("Scripting.dictionary")
cntConsec = 0
For i = LBound(srcArr) To UBound(srcArr)
cntConsec = cntConsec + 1
If i <> UBound(srcArr) Then
If srcArr(i, 1) <> srcArr(i + 1, 1) Or srcArr(i, 2) <> srcArr(i + 1, 2) Then
combID = srcArr(i, 1) & "|" & srcArr(i, 2)
If dict.Exists(combID) Then
' check if sum is more
If dict(combID) < cntConsec Then ' If new max for combination
dict(combID) = cntConsec
End If
Else
' add to dictionary
dict(combID) = cntConsec
End If
cntConsec = 0
End If
End If
Next i
ReDim destArr(1 To dict.Count, 1 To 3)
i = 0
For Each dKey In dict.keys
splitID = Split(dKey, "|")
i = i + 1
destArr(i, 1) = splitID(0)
destArr(i, 2) = splitID(1)
destArr(i, 3) = dict(dKey)
Next dKey
destsht.Range("A2").Resize(UBound(destArr), 3).Value = destArr
Application.ScreenUpdating = True
End Sub