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

Created by Roy Fahn

Solve Later

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

Solve

Solution Stats

1741 Solutions
901 Solvers

Last Solution submitted on Mar 31, 2020

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

@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

Problem Recent Solvers901

Problem Tags

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers901

Suggested Problems

More from this Author1

Problem Tags

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers901

Suggested Problems

More from this Author1

Problem Tags

Players