Today was all about strings – not the musical ones 🎸 but the tricky coding ones.
I jumped into some advanced string problems, and wow, they really stretched my brain.
Problems I tackled:
🔎 [76] Minimum Window Substring – Sliding window at its finest. Took a while to wrap my head around all the shrinking and expanding, but it’s honestly such a beautiful pattern.
✅ [20] Valid Parentheses – Classic stack problem. Still satisfying every single time the brackets line up just right.
➕ [415] Add Strings – No built-in big integer magic here, just pure digit-by-digit addition like we did in school.
🔄 [151] Reverse Words in a String – Reminded me that trimming spaces and reversing aren’t as simple as they sound.
🌱 [14] Longest Common Prefix – Surprisingly elegant once you see the trick of comparing characters across strings.
💡 Takeaways:
Sliding window problems demand patience (and lots of debugging 😅).
Stacks are lifesavers when things need to stay in order.
Sometimes coding feels like going back to primary school math (and that’s not a bad thing).
"Simple" string problems can hide messy details – trimming spaces, handling edge cases, etc.
✨ That’s a wrap for Day 4. Strings may look simple, but they sure know how to test logic and patience. On to Day 5 tomorrow!
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