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Difficulty: Medium
Category: time_series
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Topics: polars, data-processing, market-microstructure
Converting high-frequency tick data into OHLCV (Open, High, Low, Close, Volume) bars is a critical preprocessing step for market microstructure analysis and strategy backtesting. Utilizing the Polars library allows for high-performance, memory-efficient resampling of large datasets through its dynamic grouping capabilities. Task Implement the function solution(df) that accepts a Polars DataFrame containing tick data and downsamples it into 1-minute OHLCV bars. The function must return a DataFra
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