Скачать или смотреть Day 18 | Find Missing Number in Array | Java DSA

Day 18 of my #100DaysOfCode Challenge 💻🔥

📝 Problem: Find the missing number in an array containing numbers from 1 to n.

📌 Example:
Input → [1, 2, 4, 5]
Output → 3 ✅

⚡ Approaches Covered:
• Sum Formula Method (O(n))
• XOR Method (O(n))
• Both efficient & easy to understand 🚀

💡 Key Idea:
👉 If the array should contain numbers 1 to n, then:
• Sum of first n numbers = n(n+1)/2
• Missing = Expected Sum – Actual Sum

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