Problem 314. Find the sum of the elements in the "second" diagonal

Created by Roy Fahn

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Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.

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1715 Solutions
888 Solvers

Last Solution submitted on Jan 22, 2020

Last 200 Solutions

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4 Comments

4 Comments

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@bmtran (Bryant Tran) on 12 Feb 2012

you might want to make a case that's not a magic square, considering the properties of the diagonals of a magic square...

Gaik Tamazian on 17 Feb 2012

There are only magic squares in test cases, however the problem doesn't specify a type of the matrix.

David Young on 1 Mar 2012

You should definitely strengthen the test suite. Lots of solutions rely on both diagonals being the same, even though this is not a property of the stated problem.

Kye Taylor on 7 Apr 2012

The "antidiagonal" is cooler sounding than "second diagonal"

Solution Comments

Solution 778852

2 Comments

2 Comments

Brian Butler on 14 Nov 2015

I learned about fliplr() in another problem and it is helpful here!

MAHMOUD ABDEL-LATIF on 12 Jun 2019

Thanks for the hint

Solution 473608

1 Comment

1 Comment

Nicholas Hortance on 8 Jul 2015

I like you're use of a nested loop here.

Solution 250389

3 Comments

3 Comments

Haresh Varu on 29 May 2013

The last test suite result should be 14.

Abdullah Caliskan on 22 Jan 2014

yes ı agree

md.wahid tousif_rahman on 13 Jun 2017

Trickey ONE indeed !!

Solution 43073

1 Comment

1 Comment

David Young on 1 Mar 2012

But you can't rely on x always being a magic square - that's just an accident of the inadequate test suite, isn't it? So although this *looks* like a good solution, it isn't really. I think it's bad practice to take advantage of an inadequate test suite.

Solution 38468

1 Comment

1 Comment

Stephane Dauvillier on 7 Mar 2012

it doesn't find the sum of the elements of the second but first diagonal

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Problem 314. Find the sum of the elements in the "second" diagonal

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Problem 314. Find the sum of the elements in the "second" diagonal

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