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You are given three n × n matrices A, B and C. Does the equation A × B = C hold true?
The first line of input contains a positive integer n (n ≤ 500) followed by the the three matrices A, B and C respectively. Each matrix's description is a block of n × n integers.
It guarantees that the elements of A and B are less than 100 in absolute value and elements of C are less than 10,000,000 in absolute value.
Output "YES" if the equation holds true, otherwise "NO".
2 1 0 2 3 5 1 0 8 5 1 10 26
YES
| 时间上限 | 内存上限 |
| 2000 | 65536 |