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Given event timestamps and a number of ad-free coupons (or a fixed ad-free duration per coupon), determine how to cover events with ad-free intervals to maximize the number of ad-free sessions (or minimize coupons used). This reduces to sorting and greedy interval coverage / sliding-window grouping of timestamps to pack as many events as possible into each ad-free interval.
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Leetcode 1809. Ad-Free Sessions
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Source snapshot: Nov 12, 2026
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