Previous Problem https://www.mathworks.com/matlabcentral/cody/problems/45354-connect-four-01
In addition to previous problem
In this case, there can be empty places on the board represented by 0.
you have to check the validity of the board.
This is a sub-problem for the next problem of this series.
Find mistyped words in text (mixed-up letters)
Mirror Image matrix across anti-diagonal
Simple equation: Annual salary
Free passes for everyone!
Sieve of Eratosthenes - 02
Sum! Sum! Sum!
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