Symmetric Matrix

Difficulty: 1000 2000 ms 128 MB

implementation

Is the square matrix symmetric (equal to its own transpose)?

Input: the first line has N and N; the next N lines each have N integers.

Output: YES or NO.

Constraints:

• 1 ≤ N ≤ 100
• −10⁴ ≤ values ≤ 10⁴

Sample Tests

2 2
1 2
2 1

YES

2 2
1 2
3 1

NO

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