🗄️ Databases & Backend

Cracking the Sorted Subsequence of Size 3 in Java: Two Paths, One Eye-Roll

LeetCode wannabes trip over this one daily—50% fail on first pass. Two Java fixes: memory hog or space wizard?

theAIcatchup Apr 10, 2026 3 min read
Java code snippet illustrating greedy single-pass for sorted triplet subsequence

⚡ Key Takeaways

  • Greedy single-pass crushes space limits at O(1), perfect for huge arrays. 𝕏
  • Precomp approach is newbie-friendly but wastes memory on aux arrays. 𝕏
  • Both nail O(n) time; pick greedy for interviews to flex optimization chops. 𝕏
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#O(1) space optimization #O(1) space solution #O(N)-solutions #array-optimization #coding interviews #java algorithms #sorted subsequence of size 3 #sorted subsequence size 3 #sorted-subsequence

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Originally reported by dev.to

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