Problem 43801. Union Jack Matrix

  • Created by JD

Create a matrix of odd dimensions that has ones on both diagonals and dividing the matrix into 4 quadrants, resembling a square union jack flag. For example, if n=11:

1  0  0  0  0  1  0  0  0  0  1
0  1  0  0  0  1  0  0  0  1  0
0  0  1  0  0  1  0  0  1  0  0
0  0  0  1  0  1  0  1  0  0  0
0  0  0  0  1  1  1  0  0  0  0
1  1  1  1  1  1  1  1  1  1  1
0  0  0  0  1  1  1  0  0  0  0
0  0  0  1  0  1  0  1  0  0  0
0  0  1  0  0  1  0  0  1  0  0
0  1  0  0  0  1  0  0  0  1  0
1  0  0  0  0  1  0  0  0  0  1
Solve

Solution Stats

64.71% Correct | 35.29% Incorrect
Last Solution submitted on Nov 16, 2025

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ones matrix union jack

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