Matrix addition operator

Dunder methods for numeric types.

OOP dunder matrix

Implement `class Matrix` with:
- `__init__(data: list[list[float]])` — store grid
- `__add__(other) -> Matrix` — element-wise addition
- `__mul__(other) -> Matrix` — matrix multiplication (dot product)
- `__repr__` — human-readable

Constraints

All matrices have matching dimensions for the operations used.

Example

A = Matrix([[1,2],[3,4]])
B = Matrix([[5,6],[7,8]])
(A + B).data  # [[6,8],[10,12]]

22 points ~20 min

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Hints

__add__: zip rows and element-wise add. __mul__: classic triple loop or use row × column dot product.

Test Results

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