130. Surrounded Regions — flip O's not connected to border.

Use the tabs to read the prompt, implementation, and tests separately. Syntax uses Shiki; tests can be executed on the server with node --test.

Same file as in the repo · ~20s timeout

From file header (JSDoc)

130. Surrounded Regions — flip O's not connected to border.
@param {string[][]} board
@returns {void}