NeetCode #703LC-1359Hard1-D Dynamic Programming
← Back to All Problems#703 · #1359 · Count All Valid Pickup and Delivery Options(有效的快递序列数目)
📌 Problem Statement & Constraints
Given
n orders, each with a pickup P_i and a delivery D_i, count the number of valid sequences of all 2n events in which P_i always precedes D_i, modulo 10^9 + 7. Constraints: 1 <= n <= 500.🔒
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