Oracle Application Developer interview questions

second technical interview tell me about yourself explain about the questions asked in first interview and your approaches given a number 4 1,1,1,1 1,1,2 1,3 2,2 all the sets of this format without repeatitions(code should be a generic one) given a number and string find whether palindrome or not given a string,find all possible palindromes (string of length 1,2,3.....) given a set of strings-strings which are unique (not repeated)should be printed in sorted order repeated strings along with their frequencies if any string is concatination of two strings from given set of strings about projects and currently working project all solutions should be optimized

third technical interview tell me about yourself currently working project what subjects are you good at os-swapping,thrashing,semaphores,paging,scheduling algorithms dbms-given tables,some queries on that,normalization and its forms with examples,primary key,super key,composite primary key,joins c-difference between call by value and call by reference java-interface,inheritance,super keyword,final keyword,extends ,implements keywords,exceptional handling data structures-queues,stacks,linked list,binary trees given an array from 1-100,find the missing number inserting a node in the middle of linked list given a array of repeated numbers,print the numbers in such a way that numbers are printed in increasing order of their frequencies and print the numbers in increasing order if frequencies are same and codes from data structures

hr interview tell me about yourself family background in particular 3 strengths and 3 weakness about preferred location some general hr questions throughout the interviews,your way of approach to a problem is observed