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| Input:
[[1,0,0],[-1,0,3]]
[[7,0,0],[0,0,0],[0,0,1]]
Output:
[[7,0,0],[-7,0,3]]
Explanation:
A = [
[ 1, 0, 0],
[-1, 0, 3]
]
B = [
[ 7, 0, 0 ],
[ 0, 0, 0 ],
[ 0, 0, 1 ]
]
| 1 0 0 | | 7 0 0 | | 7 0 0 |
AB = | -1 0 3 | x | 0 0 0 | = | -7 0 3 |
| 0 0 1 | |