Efficient Representation of Lower Triangular Matrix into Single Dimension

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Can u please make a video for upper triangular matrix

RiteshYadav-odkf
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So, for an upper triangular matrix, the formula would be " i + j(j-1)/2 ", yeah?

naeemaibrahim
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But it will work only if index starts from 1 not applicable for a[0][j].
This is making confusion.

ashishpandey