Paisabazaar.com interview question

1st round : lowest common ancestor problem code implementation Balance parenthesis problem Longest common subsequence 2nd round: PHP design patterns PHP magic functions PHP exception handling 3rd round: Implement array sorting with best time complexity, also calculate min, max and avg at the same time, write code for the same. In MySQL how to use group function in order by clause IN MySQL select largest MEthods we do use in REST REST vs SOAP GIT