Amazon Entry Level Software Developer interview questions

Given a 2d list and a list and a x example to the list contains three lists of size 3 list contains three elements and x is 2 list and index one is one so give back the biggest one element from to the list and the next one index 2 is 2 so give me back two of the biggest in the to the array and so forth and then if x is 2 so give me the sum of two biggest nuns if cannot be done return minus one