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CodingLevel 2

Data and ML code

Easy

Medium

Hard

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StatusFormatCompany style

Easy

URL parsingWrite code · Stripe styleStripe styleWrite codeStripe style15 min Cookie header parsingWrite code · Stripe styleStripe styleWrite codeStripe style15 min User agent browser detectionWrite codeWrite code15 min Jaccard and Dice similarityWrite codeWrite code15 min Mean absolute and squared errorWrite code · Meta styleMeta styleWrite codeMeta style15 min Bag-of-words count vectorsWrite code · Meta styleMeta styleWrite codeMeta style15 min Group by and countWrite codeWrite code18 min Stock spreadWrite codeWrite code10 min Stock replenishmentWrite codeWrite code10 min Queue waiting costWrite codeWrite code10 min Count employees by departmentWrite codeWrite code10 min Average quiz scoresWrite codeWrite code12 min

Medium

HTTP request parsingWrite code · Stripe styleStripe styleWrite codeStripe style20 min DNS name decodingWrite code · Cisco styleCisco styleWrite codeCisco style20 min HTTP range headerWrite code · Netflix styleNetflix styleWrite codeNetflix style20 min Binary classifier metricsWrite code · Meta styleMeta styleWrite codeMeta style20 min Binary cross-entropy lossWrite code · OpenAI styleOpenAI styleWrite codeOpenAI style20 min Multinomial naive BayesWrite code · Meta styleMeta styleWrite codeMeta style25 min Multiclass precision and recallWrite code · Meta styleMeta styleWrite codeMeta style25 min K-fold cross-validation splitsWrite code · Meta styleMeta styleWrite codeMeta style25 min Normalize and encode tabular dataWrite code · Meta styleMeta styleWrite codeMeta style30 min Cosine similarity sparse vectorsWrite code · OpenAI styleOpenAI styleWrite codeOpenAI style20 min Perceptron training epochWrite code · Meta styleMeta styleWrite codeMeta style25 min Top k items by scoreWrite code · Netflix styleNetflix styleWrite codeNetflix style20 min

Hard

ROC-AUC computationWrite code · Meta styleMeta styleWrite codeMeta style30 min TF-IDF scoringWrite code · Meta styleMeta styleWrite codeMeta style30 min Decision stump Gini splitWrite code · Meta styleMeta styleWrite codeMeta style35 min Collaborative filtering predictionWrite code · Netflix styleNetflix styleWrite codeNetflix style35 min Pivot sparse recordsWrite code · Databricks styleDatabricks styleWrite codeDatabricks style35 min Parse nested listWrite code · Stripe styleStripe styleWrite codeStripe style35 min Parse CSV lineWrite code · Stripe styleStripe styleWrite codeStripe style35 min Digit sum 0 to nWrite codeWrite code35 min BST k-th smallestWrite code · Meta styleMeta styleWrite codeMeta style35 min Basic calculatorWrite code · Meta styleMeta styleWrite codeMeta style30 min Top k items per categoryWrite code · Databricks styleDatabricks styleWrite codeDatabricks style35 min JSON subset parserWrite code · Stripe styleStripe styleWrite codeStripe style40 min