Amadeus interview questions

Overall a very thorough process including flying me down for the interviews. Gave a very professional outlook. They conducted 3- 4 interviews including phone and face to face + written tests -

1st round - telephonic - screening 2nd round F2F - 1:1 Technical merging point of 2 link lists - complaxity? output of new int[0]? design a Text Editor system - class diagrams- show all components what is c++ - OOLanguage,procedural,functional,multi paradime language? class vs object? write a template sum, takes 2 parm as input T1,T2 and return proper return T3. if T1=int, T2= float => then T3=float if T1=short , T2 = double => then T3 = double C++ features what is lambda function?- and is it example of OOPS or Functional Programming? copy CTOR? why receive param as ref? diff between poninter vs ref vs pass by value what is NULL pointer, what if we dereference it?(what kind of run time error we get)?