Solved Arai60/62. Unique Paths #33
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fuga-98
reviewed
Jun 19, 2025
| orders_of_move_right *= (i - m + 1) | ||
| return pos_to_move_right // orders_of_move_right | ||
| ``` | ||
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fuga-98
reviewed
Jun 19, 2025
| for row in range(1, m): | ||
| paths_to_col[row] += paths_to_col[row-1] | ||
| return paths_to_col[-1] | ||
| ``` |
Fuminiton
reviewed
Jun 20, 2025
| class Solution: | ||
| def uniquePaths(self, m: int, n: int) -> int: | ||
| paths_to_grid = [[1] * m ] * n | ||
| for i in range(1, n): |
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リストのコピーではなく、リストに含まれるオブジェクトへの参照をnこ作っていることは認識しておくべきだと思います。
- If we have a mutable object (list, dict, set, etc.), we can use some specific operations to mutate it and all the variables that refer to it will see the change.
- If we have an immutable object (str, int, tuple, etc.), all the variables that refer to it will always see the same value, but operations that transform that value into a new value always return a new object.
https://docs.python.org/3/faq/programming.html#why-did-changing-list-y-also-change-list-x
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問題文：https://leetcode.com/problems/unique-paths/description/