🤯 Most people don't fail DSA because they can't code. They fail because they've never seen the pattern before. A question looks completely new... until you realize it's just: 👉 Two Sum 👉 Sliding ...
Sometimes, an entire question can be solved just using the HashMap. Other times, it may only be used to solve part of a question. 2) Recursion Fundamental for trees, graphs, backtracking, DP, and more ...
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