Two Pointers in Data Engineering

Concepts: pyMergeSorted, pyCDCDiff, pySetIntersection

Here is the thing that will make you stand out from every other candidate who can solve Two Sum: connecting the algorithm to real data engineering work. The interviewer is not just testing whether you can manipulate array indices. They are testing whether you understand that these patterns appear in the systems you build every day. When you solve a two-pointer problem and then say 'this is the same principle as a merge join in the query engine,' you have just demonstrated something most candidates never do: connecting the algorithm to the job. Merge Two Sorted Streams This is the single most important two-pointer application for data engineers. Two sorted datasets. Two cursors, one on each. Compare the elements at both cursors. Take the smaller one, advance that cursor. Repeat until both a