Input n: is an positive integer which serves as the dimension of the matrix A;
Output: A=(Aij),where each entry Aij is either 1 or -1 which is generated
For n<1 the function should deliver an empty matrix.
Which doors are open?
Getting logical indexes
Spot the outlier
Change the sign of even index entries of the reversed vector
dir with recursive subdirectory search
Travelling Salesman Problem (TSP)
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