Solution: Find the Prefix Common Array of Two Arrays
C# solution for the Find the Prefix Common Array of Two Arrays problem using the Hash Maps pattern.
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Statement
Given two integer arrays A and B of equal length n, define an array C of length n such that for each index i, C[i] equals the count of values that appear in both prefixes A[0..i] and B[0..i] (count each value at most once).
Return the array C.
Note:
AandBare permutations of the integers fromto n.
Constraints:
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