Counting past occurrence given a classification - excel

Question

I have a Table just like the one in the picture below. I want to count the number of cells in the column Leg since the last entry, given a certain classification on the column Type.
For example, for the type KFT only, how many blank entries are there in the column Legendary since the last entry for Leg?
I know how to solve this issue creating helper columns. But given that I have too many types, I would have to create a helper column for each type, making my table too big given the amount of rows I have. Is there any way I can create a VBA function to perform this task for me, such that I only need one cell per type to let me know the amount of blank cells since last Leg entry for each type? Here is a short example of how my table looks, using only 2 types:
In this example, I need a formula with output 0 for MSG, since it has been 0 entries since the last Leg for MSG, and output 2 for UNG, since it has been 2 entries since the last Leg for UNG.
Thanks so much for the help!

Answer 1

Solution 1 Using single scary formula
Alright then. I think best solution to your problem is using helper column or VBA but if you really want to use just one formula, I've something for you. This formula is very very scary and someone might give you better solution also, but this formula does work.
In the below formula I've assumed data to be in range A2:F100. Change 100 to you number of rows of data. (change all 100's, best way will be to copy formula without = in an empty sheet and then FIND 100 and REPLACE ALL to your row number)
If you have listed Types in Column H starting from Cell H2 then in Cell I2 enter the following formul, drag/copy down as required.
=COUNTIFS(INDIRECT("F" & INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=1),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1 & ":F" & IF(INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=1),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1>INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=""),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1,100,INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=""),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1)),"",INDIRECT("B" & INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=1),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1 & ":B" & IF(INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=1),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1>INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=""),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1,100,INDEX($A$2:$A$100,MAX(IF(($B$2:$B$100=H2)*($F$2:$F$100=""),ROW($B$2:$B$100)-ROW(INDEX($B$2:$B$100,1,1))+1)))+1)),H2)
This is an array formula so commit it by pressing Ctrl+Shift+Enter.
Solution 2 Using Helper Columns
Assuming you listed all Types in Column H starting from Cell H2 then in Cell I2 enter the following array formula to get the last row from data for corresponding Type in Column H and Leg =1
=INDEX($A$2:$A$11,MAX(IF(($B$2:$B$11=H2)*($F$2:$F$11=1),ROW($B$2:$B$11)-ROW(INDEX($B$2:$B$11,1,1))+1)))+1
Then in Cell J2, enter the below array formula to get the last row from data for corresponding Type in Column H and Leg ="" (blank)
=INDEX($A$2:$A$11,MAX(IF(($B$2:$B$11=H2)*($F$2:$F$11=""),ROW($B$2:$B$11)-ROW(INDEX($B$2:$B$11,1,1))+1)))+1
Next, in Cell K2, enter the below formula to set last row if there's no row corresponding to particular type for which leg is blank (for example in my sample data ABC do not have empty Leg)
=IF(I2>J2,11,J2)
Finally, in Cell E2 enter the following formula to get Count
=COUNTIFS(INDIRECT("F" & I2 & ":F" & K2),"",INDIRECT("B" & I2 & ":B" & K2),H2)