Skyline Matrix Solver Problem
Solve the system of liner equations
Ax = b
without pivoting where A is an n by n skyline matrix. A skyline matrix
has nonzero values in row i in columns k through i, 1<=k<=i, and nonzero
values in column j in rows k through j, 1<=k<=j. The values of k are
stores in two vectors: row and column.
The problem tests the ability of each language to define array structures
that include nonessential elements (i.e. the zeros), and given those
structures, support parallel and iterative array computations efficiently
(i.e. avoid the computations involving the zeros.)