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11 interview questions available

Diagnose a 10% DAU drop

Merge words by head-tail chaining

Use OrderedDict to dedupe stably

Diagnose DAU drop with SQL by country

Evaluate Widget Impact on User Engagement with A/B Testing

Explain Motivations and Cross-Functional Collaboration in Business Intelligence

Calculate Expected Flips for Heads-Tails Sequence

Prove Equal Probability Impossible with Relabeled Dice Faces

Calculate Total Spend and Identify Key User Metrics

Solve Data Structure Challenges with Python Algorithms