Tri-Color Cargo Balance

A logistics center processes items with weights 1, 2, or 3. To maintain belt stability, an engineer wants to find the longest sequence of items where the number of items of weight 1, weight 2, and weight 3 are all perfectly equal. Input Format: The first line contains N, the number of items. The second line contains N integers, each being 1, 2, or 3. Output Format: A single integer representing the length of the longest balanced subarray. Example: Input: 7 1 2 3 1 2 3 1 Output: 6 Explanation: The subarray [1, 2, 3, 1, 2, 3] has two 1s, two 2s, and two 3s.