Auto fill increment number in dynamic data ranges - excel

Question

I am stuck in my vba code and seems I setup a loop wrong. Really appreciate for some advices! Thank you very much!!
Sub code()
Dim lastRow As Long
Dim k As Integer
Dim rowPtr As Long
lastRow = Cells(Rows.Count, 1).End(xlUp).Row
For rowPtr = 2 To lastRow
If Range("A" & rowPtr + 1) <> Range("A" & rowPtr) Then
k = 1
Range("B" & rowPtr) = k
Else
If Range("A" & rowPtr + 1) = Range("A" & rowPtr) Then
Range("B" & rowPtr) = k
End If
k = k + 1
End If
Next
End Sub
Above is my code and now my VBA result is like this:
screenshot
Column C is my ideal result of the code

Answer 1

Rank Reps (Repeating Values)
Adjust the values in the constants section.
Note that Range("A" & rowPtr) is the same as Cells(rowPtr, "A") or Cells(rowPtr, 1), and Range("A" & Rows.Count) is the same as Cells(Rows.Count, "A") or Cells(Rows.Count, 1).
Option Explicit
Sub rankReps()
Const FirstRow As Long = 2
Const sCol As String = "A"
Const dCol As String = "B"
Dim cOffset As Long: cOffset = Columns(dCol).Column - Columns(sCol).Column
Dim LastRow As Long: LastRow = Range(sCol & Rows.Count).End(xlUp).Row
If LastRow < FirstRow Then
MsgBox "No data", vbCritical, "No Data"
Exit Sub
End If
' Write first.
Range(sCol & FirstRow).Offset(, cOffset).Value = 1
' Write remainder.
If LastRow > FirstRow Then
Dim cCell As Range ' Current Cell
Dim r As Long ' Row Counter
Dim rk As Long: rk = 1 ' Rank Counter
For r = FirstRow + 1 To LastRow ' +1: the first is already written
Set cCell = Range(sCol & r)
If cCell.Value = cCell.Offset(-1).Value Then
rk = rk + 1
Else
rk = 1
End If
cCell.Offset(, cOffset).Value = rk
Next r
End If
End Sub

Answer 2

Public Sub UpdateRankings(ByVal ws As Worksheet)
' Adjust as necessary.
Const firstRow As Long = 3
Const colGroupId As Long = 1
Const colRanking As Long = 6
Dim row As Long
With ws
' First value defaults to 1.
row = firstRow
.Cells(row, colRanking).Value = 1
' Remaining rows.
row = row + 1
Do While .Cells(row, colGroupId).Value <> ""
' If group id is the same as the previous row, increment rank.
If .Cells(row, colGroupId).Value = .Cells(row - 1, colGroupId).Value Then
.Cells(row, colRanking).Value = .Cells(row - 1, colRanking).Value + 1
' If group id has changed, reset rank to 1.
Else
.Cells(row, colRanking).Value = 1
End If
' Next row.
row = row + 1
Loop
End With
End Sub

Answer 3

Please, try the next way:
Sub Countcode()
Dim lastRow As Long, k As Long, rowPtr As Long
lastRow = cells(rows.count, 1).End(xlUp).row
k = 1
For rowPtr = 2 To lastRow
If Range("A" & rowPtr) = Range("A" & rowPtr + 1) Then
Range("B" & rowPtr) = k: k = k + 1
Else
If Range("A" & rowPtr) = Range("A" & rowPtr - 1) Then
Range("B" & rowPtr) = k: k=1
Else
k = 1
Range("B" & rowPtr) = k
End If
End If
Next
End Sub

Answer 4

One approach is:
Sub numberIt2()
Dim cl As Range, equal As Integer ' equal initial value is 0
Set cl = Range("A1")
Do While cl <> ""
cl.Offset(0, 1) = equal + 1
Set cl = cl.Offset(1)
equal = IIf(cl = cl.Offset(-1), equal + 1, 0)
Loop
End Sub