Fix: Improve minimum coin change logic & add doctest
- Removed unnecessary int() conversions to improve efficiency.
- Updated function parameter type (value: str → value: int) to avoid redundant type casting.
- Added try-except handling to prevent ValueError when user input is not a number.
- Implemented testmod() to enable automated doctest verification.
- Fixed issue where input denominations were not sorted in descending order, which previously led to incorrect results.
* Fix And Add power.py
To fix the inaccuracies and allow handling of negative exponents and bases, the key issue lies in how negative numbers are handled in the power calculation, especially when dividing.
## Example Output:
```python
>>> power(4, 6)
4096
>>> power(2, 3)
8
>>> power(-2, 3)
-8
>>> power(2, -3)
0.125
>>> power(-2, -3)
-0.125
```
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* Fix leap year check
Replace `!=` in `(year % 400) != 0` (line 49) with `==`
Justification: Years that are divisible by 100 (centurian == 100) but not by 400 (year % 400 != 0) are skipped and NOT leap year.
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* [ADDED] Implementation of Geometric Mean.
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* Contributes to #9943 by adding tests to monotonic_array.py
Addeded doctest in the if __name__. Checks for negaitves and an array of same integers
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- Utilized `lanczos_iteration` to construct tridiagonal matrices, optimized for large, sparse matrices.
- Added `multiply_matrix_vector` for efficient matrix-vector multiplication using adjacency lists.
- Included `validate_adjacency_list` for input validation.
- Supports varied graph analysis applications, particularly for analyzing graph centrality.
- Included type hints, comprehensive docstrings, and doctests.
- PEP-8 compliant, with optimized handling of inputs and outputs.
This module provides essential tools for eigenvalue-based graph analysis, ideal for centrality insights and structural assessments.
* #9943 : Adding coverage test for basic_graphs.py
* #9943 : Adding coverage test for basic_graphs.py
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* [0, 1, 1]], dtype=int32)
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