Superdiagonals X54207


Statement
 

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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/Diagonal#Matrices); 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.

Public test cases

  • Input

    3
0 2 0
0 0 3
0 0 0
4
1 0 1 1
2 2 0 2
3 3 3 0
4 4 4 4
1
-1234
2
77 1
88 99

    Output

    5
0
0
1
    • Information
    Author
    José Luis Balcázar
    Language
    English
    Official solutions
    Python
    User solutions
    Python