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List for storage with the two fork structures (a) to carriage return ( ' \ n' ) for the input end of the symbol, enter the number of columns L, respectively, generating a binary sort tree T and balanced binary sort tree BT (2) right two binary sort tree T in order to make traversal, the output results (3) input element x, to find two binary sort tree T: if there exists node containing x, then delete the node, and for medium-order traversal (to perform operations 2 ) otherwise, the output-related information (4) were calculated T, BT Find the average successful search length, the output results