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@Vipresh Gangwal: there is no need to publish test problems. You can click the Unpublish button on the problem's edit page to remove it from public view until it is complete. Also, you can, and should, supply a reference solution and use the "Test reference solution" button on the edit page to ensure that the problem is solvable and properly functioning before it is published.
Back to basics 8 - Matrix Diagonals
Back to basics 22 - Rotate a matrix
Set some matrix elements to zero
Matlab Basics II - Max & Index of Max
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