The interview was an automated, proctored test that had 5 stages. The questions in the test were vague and difficult, accounting for several hours in front of the computer.

Each section "covered" a different area:

• Technical skills (solving algorithmic-related problems)
• IQ (a timed IQ exam)
• Various other topics

Although each individual question wasn't too tough, after several hours in front of the computer, my brain was fried...

Create an algorithm that generates every possible combination that a group of letters can be organized into.

For example: abc abc, acb, bac, bca...