Writing
Notes on building things and figuring them out.
Finding a cost-function minimum with gradient descent
Trace how gradient descent updates a parameter, chooses a learning rate, and converges toward a local minimum.
Finding duplicate values in an array
Compare brute force, sorting, hash-table, and cycle-detection approaches, with the time and space trade-offs of each.
Measuring the length of a number
Compare arithmetic and string-based ways to count a number's digits, including the edge cases each approach needs to handle.
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