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maths: add O(log n) Fibonacci via matrix exponentiation #14557

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maths: add O(log n) Fibonacci via matrix exponentiation #14557

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53a30c4
maths: add O(log n) Fibonacci via matrix exponentiation
Apr 14, 2026
66919bd
style: fix ruff linting — replace ambiguous multiplication sign, appl…
Apr 14, 2026
4280d0e
fix: use descriptive parameter names (mat_a, mat_b, index) per review
AKIB473 Apr 15, 2026
382ee44
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 15, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks 
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pre-commit-ci[bot] committed Apr 15, 2026
commit 382ee4435a6be23dfaafb79597f70e85971e5632
4 changes: 1 addition & 3 deletions maths/fibonacci_fast.py
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Expand Up @@ -15,9 +15,7 @@
"""


def _mat_mul(
mat_a: list[list[int]], mat_b: list[list[int]]
) -> list[list[int]]:
def _mat_mul(mat_a: list[list[int]], mat_b: list[list[int]]) -> list[list[int]]:
"""Multiply two 2x2 integer matrices.

>>> _mat_mul([[1, 1], [1, 0]], [[1, 0], [0, 1]])
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