Two List Tasks

January 2, 2018

We have today two simple exercises on lists:

  1. Given a list of lists of integers, all the same length, return a list of the sums of the lists. For instance, given the list ((1 2 3 4) (2 3 4 5) (3 4 5 6)), return the list ((+ 1 2 3) (+ 2 3 4) (+ 3 4 5) (+ 4 5 6)), which is (6 9 12 15).
  2. Given a list of integers of length n = k × m, return a list of k items, each containing the sum of the next m integers from the original list. For instance, given the list, (1 2 3 4 2 3 4 5 3 4 5 6) and sub-list length m = 4, return the list (10 14 18).

Your task is to write programs that perform the two tasks. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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