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Govind Pothuraju on Instagram: "Day 39/200: The Power of Prefix Sum — The Trick Every Top Coder Knows! ⚡ Have you ever calculated the sum of elements in a subarray using two loops? That’s slow ❌ — let’s make it lightning fast ⚡ ✅ Prefix Sum Formula: prefix[i] = prefix[i-1] + arr[i] ✅ Query Example: To get sum from index l to r: prefix[r] - prefix[l-1] Example: Input: arr = [2, 3, 5, 1, 6] Prefix: [2, 5, 10, 11, 17] Sum(1,3) = prefix[3] - prefix[0] = 11 - 2 = 9 💡 Why it’s powerful: Speeds up ran

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