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Anjali Kumari on Instagram: "Missing Number | Brute Force to Optimized Brute Force Idea: Loop from 0 to n, calculate total sum, then subtract the sum of array elements. Time: O(n) | Space: O(1) Good for understanding, but still loop-based thinking. Optimized Idea: Use math formula or XOR to avoid extra iterations and use patterns instead. Same O(n) time, but cleaner logic and safer from overflow. Why optimization matters? This XOR thinking helps in problems like Single Number, Single Number II,