Given an array of strings, return groups of "buddy strings," where the strings have the same length and the distance between corresponding characters is the same.

"I got in through a referral, so I didn't have a recruiter screen and went straight into interviews. I applied around the end of September, didn't hear back until mid-November, then did two 45-minute virtual rounds in December: one technical and one googliness/behavioral. I heard back within the week that I passed, then had about another month to prep before the onsite in mid-January, which was just two more 45-minute technical interviews. The coding questions felt more custom than straight LeetCode, and the main thing Google seemed to care about was how I clarified the problem, communicated my thinking, and reasoned my way to a solution. I made it through the full loop but got rejected, and the timing was all over the place because the first feedback came quickly while the final decision took about three weeks."