Description: A sparse matrix is a 2D matrix that has many zeros. Assume that for storage efficiency someone has converted a sparse matrix into a compact 2D matrix with dimensions Nx3 where N is the number of non-zero items in the original sparse matrix. In each row of compact, the first column holds the value of a non-zero item of the sparse matrix, the second column holds the row that this item resides in the sparse matrix, and the third column holds the column that this item resides in the sparse matrix. Write a function that given a compact matrix it returns the original sparse matrix. Assume the last row and the last column of the sparse matrix contain at least one non-zero item.

Through the process of sedimentation,sediment is turned back to rock to form sedimentation.the process of sedimentation is: > deposition-where fragments were deposited into the river or sea under gravity or travelling agent such as wind or water. > sedimentation-the fragments deposited in the river sedimented and accumulate> compaction-the layers of fragments deposited undergoes compaction due to the weight if the upper layers> cementation-chemical substance of the fragments such as cement dissolved into the water and cement the other fragments together to form sedimentary rock.thus,cementation and compaction are the process.on the other hand, transformation only occur when a rock under goes metamorphism(compaction or extreme heat).while recrystillization occurs when a rock is melted and cooled down,which also requires metamorphism to take place.hope it !

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