Add outer square X59930

Statement

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Design a function suma_qext(mat) which, given a list of lists mat with a matrix of size m*n∣ m,n>1, returns the sum of the elements of the outer box.

Sample session

>>> mat = [[5,6,4,7,3],[9,3,7,4,2],[7,3,4,8,2],[2,3,6,2,2],[6,7,1,1,6]]
>>> suma_qext(mat)
70
>>> m = [[4, 4, 4], [4, 2, 9], [7, 2, 7], [1, 2, 3]]
>>> suma_qext(m)
45
>>> suma_qext([[1,1],[2,2]])
6

Information

Author: InfBesos
Language: English
Translator
Original language: Spanish
Other languages: Catalan Spanish
Official solutions: Python
User solutions: Python