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For a long time I split backtracking into two mental buckets. There was the easy bucket, subsets and permutations, which I could write in my sleep. And there was the scary bucket, N-queens and Sudoku
I spent two months drilling the seven patterns until I could name any of them on sight. Sliding window, two pointers, BFS, DFS, binary search, DP, Dijkstra. Show me a problem, I tell you the pattern.
At problem 47 I thought I was making progress. At problem 83 I was confident. At problem 100 I felt ready. Then I failed the interview. Not because the problem was impossibly hard. Because I had solve
Most DP guides teach you solutions. This one teaches you derivation. There is a meaningful difference between the two. When you memorize a solution, you can reproduce it on the exact problem you pract
Graphs are the most feared topic in coding interviews — not because they're impossible, but because most people learn the algorithms in isolation without understanding when to use each one. This guide
You've solved 150 problems. You read the editorial. You watched the NeetCode video. And then a slightly different problem appears in the interview and you blank. It's not you. It's what you've been pr
