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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Difficulty Alpha
Given a square matrix. Check whether it is symmetrical
about the main diagonal.
Input
The first line contains the number n (0 < n ≤ 100).
The following n lines contain n integers, not
exceeding modulo 100,000.
Output
Say "YES", if the matrix is symmetric about the main diagonal,
otherwise withdraw "NO".
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Input
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3
1 2 3
2 4 5
3 5 6
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Output
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YES
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Для отправки решений необходимо выполнить вход.
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