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 ]
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 11 - Max Integer
Number of digits in an integer
Area of an Isoceles Triangle
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