For each of 10 representative problems: concise pack (Problem — Constraints — Key idea — Code sketch — Complexity — Testcases)
(HashMap – O(n) time, O(n) space)
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PacktPublishing/Java-Coding-Problems-Second-Edition – Covers over 200 brand-new problems for modern Java up to JDK 21. For each of 10 representative problems: concise pack
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