Leetcode 2657. Find the Prefix Common Array of Two Arrays

Given two permutations A and B of 1..n, produce array C where C[i] is the number of values that appear in both prefixes A[0..i] and B[0..i]; this is solved by incrementally tracking seen elements in each array and counting newly common values.

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Leetcode 2657. Find the Prefix Common Array of Two Arrays

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