feat: update solutions to lc problems: No.3661,3418

[yanglbme]

No description provided.

[Copilot]

Pull request overview

This PR updates Python implementations (and their README code snippets) for two LeetCode problems to clear @cache memoization state after computing the final answer, aligning them with the repo’s common Python solution pattern.

Changes:

• Store the DFS result in ans before returning.
• Call dfs.cache_clear() to clear memoized state after use.
• Mirror the same change in both Chinese and English README solution snippets.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
solution/3600-3699/3661.Maximum Walls Destroyed by Robots/Solution.py	Clear DFS cache after computing answer to avoid lingering memoized state.
solution/3600-3699/3661.Maximum Walls Destroyed by Robots/README.md	Update Python snippet to clear DFS cache after computing answer.
solution/3600-3699/3661.Maximum Walls Destroyed by Robots/README_EN.md	Update Python snippet to clear DFS cache after computing answer.
solution/3400-3499/3418.Maximum Amount of Money Robot Can Earn/Solution.py	Clear DFS cache after computing answer to avoid lingering memoized state.
solution/3400-3499/3418.Maximum Amount of Money Robot Can Earn/README.md	Update Python snippet to clear DFS cache after computing answer.
solution/3400-3499/3418.Maximum Amount of Money Robot Can Earn/README_EN.md	Update Python snippet to clear DFS cache after computing answer.

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