🔥 This is a perfect “pre-flight checklist” before diving into advanced algorithms. HashMaps, recursion, DFS/BFS, binary search, sliding window, heaps — master these, and a lot of interview problems ...
The brute-force solution was easy to write. The problem was that it completely fell apart on large ranges due to Time Limit Exceeded. That's when I knew this was going to be a Digit DP problem. And ...
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