Grocery Checkout Coupons with Category Stacking and a Discount Cap

Asked at Palantir · Coding Questions · Difficulty: Medium · Last asked Sep 19, 2026

A grocery chain is piloting checkout coupons, but its point-of-sale system has no discount support. Write the function that takes a shopping cart and a list of coupons and returns the receipt totals: the price before discounts, the total amount saved, and the amount the customer pays. All money is in integer cents, and the result must be exact to the cent.

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