Given a x-by-x matrix filled with zeros (x is odd and > 1). Use ones to draw a number 1 into it! Like this:
x = 5, y =
0 1 1 0 0
0 0 1 0 0
0 0 1 0 0
0 0 1 0 0
0 0 1 0 0
x = 7, y =
0 0 1 1 0 0 0
0 0 0 1 0 0 0
0 0 0 1 0 0 0
0 0 0 1 0 0 0
0 0 0 1 0 0 0
0 0 0 1 0 0 0
0 0 0 1 0 0 0
Solve

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Last Solution submitted on Jul 24, 2026

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Adri Nabil Hossain Mashrafe Irfan

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