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add notation of m and n in analysis of complexity (#1621)

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* fix: notation of m and n in analysis of complexity

As title, complexity variable is not defined previously.

* Update dp_solution_pipeline.md

* Update dp_solution_pipeline.md

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Co-authored-by: Yudong Jin <krahets@163.com>
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Peter Chen; Kohan Chen 2025-01-21 19:18:03 +08:00 committed by GitHub
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docs/chapter_dynamic_programming/dp_solution_pipeline.md
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@ -110,7 +110,7 @@ $$
![暴力搜索递归树](dp_solution_pipeline.assets/min_path_sum_dfs.png)
每个状态都有向下和向右两种选择，从左上角走到右下角总共需要 $m + n - 2$ 步，所以最差时间复杂度为 $O(2^{m + n})$ 。请注意，这种计算方式未考虑临近网格边界的情况，当到达网络边界时只剩下一种选择，因此实际的路径数量会少一些。
每个状态都有向下和向右两种选择，从左上角走到右下角总共需要 $m + n - 2$ 步，所以最差时间复杂度为 $O(2^{m + n})$ ，其中 $n$ 和 $m$ 分别为网格的行数和列数。请注意，这种计算方式未考虑临近网格边界的情况，当到达网络边界时只剩下一种选择，因此实际的路径数量会少一些。
### 方法二：记忆化搜索