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.
Word Counting and Indexing
Remove the air bubbles
Find best placement for ordered dominoes (harder)
Concatenate two strings
dir with recursive subdirectory search
Travelling Salesman Problem (TSP)
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