9 lines
241 B
Python
9 lines
241 B
Python
from typing import List
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def det2x2(llist: List[List[int]])->int:
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assert len(llist) == 2 and len(llist[0]) == 2, "Matrix is not 2x2"
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z = list(zip(llist[0], llist[1][::-1]))
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det = z[0][0]*z[0][1] - z[1][0]*z[1][1]
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return det
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