text: Find root of the tree
code: r = - 1 NEW_LINE for i in range ( 1 , n + 1 , 1 ) : NEW_LINE INDENT if ( root_node [ i ] ) : NEW_LINE INDENT r = i NEW_LINE break NEW_LINE DEDENT DEDENT Ideal_pair = dfs ( r , 0 ) NEW_LINE return Ideal_pair NEW_LINE