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After-school design of data structure problems Chapter 5.23 ② triple a variant of the table is removed from the triple line of the table fields are binary group subscript table, a separate line starting vector, each of its component is a binary set of tables under the standard value, indicating the line of the first non-zero elements in the binary set of tables in the starting position. Write a test method, the matrix elements of the value of the subscript i, j element of a matrix. Discuss this method and the table triples compared to what the advantages and disadvantages.