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Logic problems. The solution to these problems does not usually require a lot of math, but will take some thinking until you find the right approach.
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Difficulty: 2 of 5 Latest: BAD Ceed
You are to place one each of A, B, C and D in each row of the below grid, leaving one cell blank. Do this in such a way that each column will also have one each of A, B, C and D and one blank.

Around the edges have been placed letters indicating the closest non-blank entry in that row or column. For example, the A to the right of row 2 indicates that the last non-blank in that row should be an A. The first non-blank in that row will be a D as indicated by the D to the left of that row.

          A       D         
   ++===+===+===+===+===++  
   ||   |   |   |   |   ||  
   ++---+---+---+---+---++  
 D ||   |   |   |   |   || A
   ++---+---+---+---+---++  
   ||   |   |   |   |   || B
   ++---+---+---+---+---++  
   ||   |   |   |   |   ||  
   ++---+---+---+---+---++  
 B ||   |   |   |   |   || A
   ++===+===+===+===+===++  
      C                     

From Mensa Puzzle Calendar 2019 by Fraser Simpson, Workman Publishing, New York. Puzzle for February 19.
(Solution Posted, 1 Comments) Submitted on 2019-02-27 by Charlie   
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