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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from typing import List
def min_sum_path(matrix: List[List[int]]) -> int:
rows = len(matrix)
columns = len(matrix[0])
for i in range(1, rows):
matrix[i][0] += matrix[i - 1][0]
for j in range(1, columns):
matrix[0][j] += matrix[0][j - 1]
for i in range(1, rows):
for j in range(1, columns):
matrix[i][j] += min(matrix[i - 1][j], matrix[i][j - 1])
return matrix[-1][-1]
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(f"Minimum sum path: {min_sum_path(matrix)}") # Output: 21
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