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The candidate's solution correctly uses a DFS algorithm to find the longest path in the array. The algorithm is optimal because it only needs to traverse the array once. However, there are a few errors in the implementation of the DFS function. First, the base case should check if the current element is out of bounds or if the current element is already visited. Second, the path variable should be initialized to 1 before the recursive call. Third, the DFS function should return the path variable after the recursive call. Fourth, the visited array should be reset after the DFS call.