Pergunta de entrevista da empresa Arista Networks

One programming question on finding the missing number in a sequence of numbers. Questions on size of different C structs (padding). Why do we use a double pointer in linked list? You need to print elements of a 2-D arrays using 2 for loops with indices "i" (outer loop) and "j" (inner loop), why is using a[i][j] faster than a[j][i]? 2 questions on bit manipulations. Internship location is Nashua.