Enigma 1204: Small fitogether
8 September 2015
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From New Scientist #2360, 14th September 2002 [link]
I secretly write the 3×3 square:
I then tell you that the horizontal rows of my square were 231, 312 and 123 and the vertical columns 213, 321 and 132, in some order. If you can work out what my square was then it is called a “fitogether”. (If you check you will see this square is not a fitogether).
Similarly, I can start with any n×n square of numbers where each row and each column contains 1, 2, 3, … n. I tell you the rows and columns in some order and you try to work out my square; if you can, it is called a fitogether. We only consider n if it is at least 2.
The value of a square of numbers is the number obtained by writing the the rows one after the other in order with the top row at the left. For example, the square above has value 312231123.
Find the bottom row of the fitogether with the smallest value.