given list of [date, item] purchases. popcorn + soda same day = $9 bundle. else $2.50 / $8 separately. compute total. key: handle multiple purchases of same item same day (do they bundle pairwise?). asked interviewer, they said yes pairwise. result: per-day greedy bundle as many pairs as possible, charge remainder separately.

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Shopify pair programming - grocery

given list of [date, item] purchases.