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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Last Solution submitted on Jan 21, 2026

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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"

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

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Last 200 Solutions

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Problem Recent Solvers1200

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