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

Created by Roy Fahn

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<div style = "text-align: start; line-height: 20.4333px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: rgb(0, 0, 0); white-space: normal; "><div style="block-size: 21px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 10.5px; transform-origin: 407px 10.5px; vertical-align: baseline; "><div style="font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 10.5px; text-align: left; transform-origin: 384px 10.5px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 355.5px 8px; transform-origin: 355.5px 8px; unicode-bidi: normal; "><span style="">Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.</span></span></div></div></div>

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Solution Stats

2094 Solutions
1067 Solvers

Last Solution submitted on Oct 03, 2022

Last 200 Solutions

Problem Comments

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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Last 200 Solutions

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Problem Recent Solvers1067

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