Given an x-by-x matrix filled with zeros (x is odd and > 3). Use 2s to draw the number 2 into it! Like this:
x = 5, y =
2 2 2 2 2
0 0 0 0 2
2 2 2 2 2
2 0 0 0 0
2 2 2 2 2
x = 7, y =
2 2 2 2 2 2 2
0 0 0 0 0 0 2
0 0 0 0 0 0 2
2 2 2 2 2 2 2
2 0 0 0 0 0 0
2 0 0 0 0 0 0
2 2 2 2 2 2 2
Solve

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Last Solution submitted on Feb 22, 2026

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Thilanka Udara Truong Minh 泽伟 bao

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