ALT Approach : * Convert the array to a set: This helps remove duplicates and allows faster lookup. * Loop through each element in the array: Check if it's the start of a sequence (by checking if the previous element is not in the set). *Count the consecutive sequence: If the next consecutive number exists in the set, keep counting. * Track the longest sequence: Update the longest sequence found as we go through the array.

ALT Approach: Use a set to store unique elements from both arrays. First loop through array a and add each element to the set. Then loop through array b and do the same. Since sets store only unique values, all duplicates will be automatically filtered out. Return the length of the set = count of unique union elements. Time Complexity: O(n m) — Traverses both arrays once. Space Complexity: O(n m) — In the worst case, all elements are unique.