In a compact one-dimensional array representation for a lower triangular…

ISRO Scientist/Engineer SC · December 2017 · Computer Science

In a compact one-dimensional array representation for a lower triangular matrix (all elements above the diagonal are zero) of size n x n, non-zero elements of each row are stored one after another, starting from the first row, the index of (i, j)th element in this new representation is

  1. A.

    i + j

  2. B.

    j + i(i - 1)/2

  3. C.

    i + j - 1

  4. D.

    i + j(j - 1)/2

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Correct answer: B

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