ServiceNow Software Engineer interview questions

Round 1: I was asked about my projects and few simple questions. 1. check if a number is palindrome(You can't parse into string, you have to separate digits and then compare after reversing). 2. check if sum or 2 numbers in array are equal to a target number in O(N) Round 2: Again some chat with the interviewer and then he moved to questions. 1. Check if a number is prime. 2. Check if a string is palindrome. 3. Check if strings in a list form a string. Just return True or False. for example: arr = ["hos","tal","pit","p","it","pi"] target = "hospital" Round 3: Interviewer asked about most recent project that I have worked on. Chatting about company, - difference between static and non static function - interfaces vs abstract classes (gave scenerio and asked which one you will choose) - a little bit of inheritance. - Is c object oriented? - Is C++ object oriented? - is python object oriented? - Meta class in python. and more short questions.