______ __ ______ / ____/___ ____/ /__ _____/ ____/_ ______ / / / __ \/ __ / _ \/ ___/ / / / / / __ \ / /___/ /_/ / /_/ / __/ / / /___/ /_/ / /_/ / \____/\____/\__,_/\___/_/ \____/\__,_/ .___/ /_/

$1,500 in prize money and unique problems. Register for the TrialSpark x Coder Cup competition by Feburary 22 before space runs out. Also, TrialSpark is hiring engineers.

Register

The most creative correct solution wins $100. Submissions for prize money are now closed.

A 4x4 grid is filled with digits d, 0 ≤ d ≤ 9. It can be seen that in the grid 6 3 3 0 5 0 4 3 0 7 1 4 1 2 4 5 the sum of each row and each column has the value 12. Moreover the sum of each diagonal is also 12. In how many ways can you fill a 4x4 grid with the digits d, 0 ≤ d ≤ 9 so that each row, each column, and both diagonals have the same sum? https://projecteuler.net/problem=166

You have unlimited submission attempts.

We will email you if you've won and let you know about the next one.

Continue