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Crack the code, ace the interview
28 posts
Showing 13-24 of 28 posts
Master the Linear DP pattern by deriving Climbing Stairs and House Robber from first principles. One template, five lines, dozens of LeetCode wins.
Master Bounded Knapsack DP. Add a dimension per constraint, loop backwards, and crack Ones and Zeroes and Profitable Schemes like a candidate.
See how AWS-style networks find the cheapest way to connect every region. Interactive visualizer, Python walkthrough, and pattern recognition guide.
Step through Prim's algorithm visually. See how a min-heap grows the minimum spanning tree, with interactive simulator and Python code.
How Tarjan's algorithm finds recommendation loops in directed graphs. Netflix-style example, interactive visualizer, Python benchmarks.
See how graph algorithms let Google Maps skip 96% of roads. Benchmark with 40K intersections, full Python code, and interactive simulator.
Learn why 3Sum reduces to sorted Two Sum. Interactive visualizer shows how fixing one element and using two pointers drops O(n³) to O(n²).
Learn why water at each bar depends on its tallest neighbors. Interactive visualizer shows how two pointers find trapped water in one pass.
Learn why the shorter wall limits everything. Interactive visualizer shows how two pointers eliminate entire rows of possibilities in one pass.
See why Next Permutation is about finding the rightmost ascent. Interactive visualizer shows how one scan from the right transforms O(n!) brute force into O(n).
See why Two Sum is just an existence check. Interactive visualizer shows how one equation turns O(n²) brute force into O(n) with hash maps.
Visualize why O(log n) feels like magic. Watch binary search rip through a phonebook while linear search flips page by page.