#19 · Missing number in array — Simply Explained (with Python) | DSA
📺 DSA Series — Lesson 19 of 110
Missing number in array — An array holds 0..N with one value missing; find the missing number. We build the intuition first, then write it in clean, runnable Python. Perfect if you're starting Data Structures & Algorithms. 🚀
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⏱️ CHAPTERS 0:00 Intro 0:15 Key idea ⚡ 0:39 The code 1:52 How fast 2:05 Remember
📚 In this lesson • The intuition behind the problem • The approach / pattern: XOR / math • Writing the solution in Python, line by line • Time & space complexity — why it's efficient • Common mistakes to avoid
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