Leetcode Problem 2657. Find the Prefix Common Array of Two Arrays

2657. Find the Prefix Common Array of Two Arrays

Leetcode Solutions

Using Counting and Prefix Sum

  1. Initialize a counting array count of size n+1 to store the counts of elements (since elements are from 1 to n).
  2. Initialize a result array C of the same length as A and B.
  3. Initialize a variable common to keep track of the number of common elements seen so far.
  4. Iterate through the arrays A and B using an index i: a. Increment count[A[i]]. b. If count[A[i]] becomes 0 after incrementing, increment common. c. Decrement count[B[i]]. d. If count[B[i]] becomes 0 after decrementing, increment common. e. Set C[i] to common.
  5. Return the result array C.
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Brute Force Approach

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