Unfold a 2-D matrix to a 1-D array in zig-zag order, e.g., for matrix
[ 1 2 3 ;
4 5 6 ;
7 8 9 ]
the resulting 1-D array should be
[ 1 2 4 7 5 3 6 8 9 ]
Check if number exists in vector
Getting the indices from a matrice
Magic is simple (for beginners)
02 - Vector Variables 3
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