How to place exactly 2 elements in every 2x2 sub array

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how to place exactly 2 elements in every 2x2 sub array in nxn int array such that the sum is maximum?

for example, if you have 3x3 array [5 1 4] [1 8 2 ] [1 7 1] you will place in the following way (every 2x2 sub array we place exactly 2 elements denoted as p) to maximize the sum

[p 1 p] [1 p 2] [1 p 1] such that sum = 5+4+8+7=24

if you place like [p 1 p] [p 8 p] [1 p 1] will give sum = 5+4+1+2+7=19 which is not maximum.

What I have tried:

i tried so hard. but cannot seem to figure out a way to do it. brute force will time out.

Posted 23-Jan-21 9:00am

Member 15054232

Updated 23-Jan-21 10:01am

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Patrice T 23-Jan-21 15:07pm

Show your brute force code.

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Christian Graus · Answer 1 · 2021-01-23T10:01:00

Solution 1

So you want to first find each unique element. I would do that with a list. Go through them all, and only add to the list if it does not exist. You don't need a 2x2 array to then add those values

Posted 23-Jan-21 10:01am

Christian Graus