repo-solution-and-tests-colocated

Status: IN

Solution classes and unit tests coexist in the same `solution.py` file with an `if __name__ == "__main__"` guard, following a repo-wide convention.

Source: entries/2026/06/06/two-furthest-houses-with-different-colors-solution.md, entries/2026/06/06/two-sum-iv-input-is-a-bst-solution.md

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