two-solution-conventions-coexist

Status: IN

The repo uses two conventions for solution entry points: `Solution` class with a method (LeetCode boilerplate style, e.g., `runningSum`) and standalone module-level functions (e.g., `is_same_tree`, `can_transform`, `roman_to_int`).

Source: entries/2026/06/06/same-tree-solution.md

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