Superdiagonals

The superdiagonal of a matrix m is formed by the elements m[i][j] in the
matrix for which the column is one position more than the row: j = i + 1
(see https://en.wikipedia.org/wiki/Main_diagonal#superdiagonal); that
is, those elements lying along the diagonal just above the main
diagonal. Write a program that computes the sums of the superdiagonals
of several matrices.

Input

Input is a sequence of cases. Each case starts with a nonnegative
integer n, followed by a square n × n matrix of integers.

Output

The sum of the superdiagonal elements of each matrix, in the same order,
each in a line of its own.

Problem information

Author: José Luis Balcázar

Generation: 2026-05-04T15:00:24.292Z

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