I was asked to write programs for two questions. Once that was done, I was told to optimize the two programs.

After another hour, I was asked to further bit-optimize those two programs.

Then, I was taken to one more meeting room, where I was left for another hour before he returned.

I was literally locked in it without access, while he was spending his time with other colleagues. A waste of time.

Sorting alternative numbers in a row in ascending and descending order.