you shud send two lists.... 1.traversed in "in-order" fashion 2.traversed in "pre-order" fashion

BFS is good. So, lets say we use equal length records and we use some sort of array or file structure. Lets assume for now payload is integer. let bst be such as this 1 2 3 4 0 5 6 0 7 0 0 Serizalize it as D,2,3,D,4,0,D,5,6,,D,0,0,D,0,7,D,0,0,D,0,0