Day 9/365: Basic Array Operations -- DSA & System Design

365 Day DSA & System Design Challenge

Day 9 was about making simple array tasks do real teaching work.

What I wanted clear today:

• reverse-array problems compare extra-space and in-place thinking cleanly
• rotation rewards structure over repeated shifting
• max/min should usually become a clean one-pass scan
• second-largest trains running-state discipline
• edge cases show up fast even in simple operations

The biggest shift was realizing that these tasks are not trivial drills. They are a great place to build habits that show up again in much harder problems. That makes them useful practice, not just warm-up material for later topics.

That made Day 9 much more useful than a warm-up day. It turned basic operations into a way to practice cleaner algorithm judgment.

---

Day 9/365 of the 365 Day DSA & System Design Challenge.