DSA: Topic 3: Two Pointers

Interview frequency: ⭐⭐⭐⭐⭐ (Top 5 pattern) Many candidates fail interviews not because they don't know algorithms, but because they don't recognise when to use Two Pointers. What is the Two Pointers technique? Instead of using one index: i = 0 you use two indices. left = 0 right = len(arr) - 1 These pointers move based on the problem. Example:...