Create an N×N matrix that forms a hollow diamond shape using 1s, leaving the interior empty. This challenge emphasizes boundary detection and symmetry handling.
e.g. N=5
1 1 0 1 1;
1 0 1 0 1;
0 1 1 1 0;
1 0 1 0 1;
1 1 0 1 1
Solve

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Last Solution submitted on May 24, 2026

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Chris Cleveland ChrisR David Hill Pauli Huusari

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