Python:实现minimum cost path最小成本路径算法

from __future__ import annotations
def minimum_cost_path(matrix: list[list[int]]) -> int:


    # preprocessing the first row
    for i in range(1, len(matrix[0])):
        matrix[0][i] += matrix[0][i - 1]

    # preprocessing the first column
    for i in range(1, len(matrix)):
        matrix[i][0] += matrix[i - 1][0]

    # updating the path cost for current position
    for i in range(1, len(matrix)):
        for j in range(1, len(matrix[0])):
            matrix[i][j] += min(matrix[i - 1][j], matrix[i][j - 1])

    return matrix[-1][-1]


if __name__ == "__main__":
    import doctest

    doctest.testmod()