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Given a vector of n values (x1,x2,x3,...,xn) return the determinant of the corresponding Vandermonde matrix \$V(x_1, x_2, \ldots, x_n)\$.
This determinant can be written as:
\$\det V(x_1, x_2, \ldots x_n) = \prod_\limits{1 \leqslant i < j \leqslant n} (x_j - x_i)\$
Details
Your program/function h...