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.
Make a checkerboard matrix
Find common elements in matrix rows
Bottles of beer
Create incrementing array
Travelling Salesman Problem (TSP)
dir with recursive subdirectory search
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