Given a x-by-x matrix filled with zeros (x is odd and > 3). Use 7s to draw a number 7 into it! Like this:
x = 5, y =
7 7 7 7 7
0 0 0 0 7
0 0 0 0 7
0 0 0 0 7
0 0 0 0 7
x = 7, y =
7 7 7 7 7 7 7
0 0 0 0 0 0 7
0 0 0 0 0 0 7
0 0 0 0 0 0 7
0 0 0 0 0 0 7
0 0 0 0 0 0 7
0 0 0 0 0 0 7
Solve

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Last Solution submitted on Feb 14, 2026

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Michal 泽伟 bao 灰

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