🔍 Finding Missing Numbers in an Array using Java Streams

Input: [1,2,1,2,5,8] Output: [3,4,6,7] 🧠 Approach: 1️⃣ Find minimum and maximum values 2️⃣ Store elements in a Set for fast lookup 3️⃣ Generate range between min and max 4️⃣ Filter out numbers that are not present ❓ Why rangeClosed() and not range()? IntStream.range(start, end) → excludes end value IntStream.rangeClosed(start, end) → includes end value 👉 Example: range(1, 5) → 1,2,3,4 rangeClosed(1, 5) → 1,2,3,4,5 💡 Since we want to check all numbers from min to max (inclusive), we use rangeClosed(min, max).