The Empty Counter

Sometimes the server calls NEXT! at an empty counter. Awkward. 😶

You get commands (join:name / serve) — but serves may hit an empty line. For each empty serve, print nobody here on its own line. At the end print the number still waiting.

Example:

Input: commands = ["serve", "join:mia", "serve", "serve"] Output:

nobody here
nobody here
0

The first serve hits an empty line (nobody here). mia joins, and serving her empties the line again, so the third serve also finds nobody — leaving 0 waiting at the end.