are tasked with developing a resource allocation tool for a logistics company, where certain items need to be packed into containers. However, each container has a weight limit$,$ and your goal is to figure out whether you can exactly fill one container using a subset of items from the available set. Given that the weight limit of container is $9$ and the weights of available items are $(3,1,4,2,5\},$ use the backtracking approach to determine if there exists a subset of items whose weights sum up to the weight limit of the container.

List all the subsets that are considered during the backtracking process and clearly state whether each subset meets the target sum. What is the time complexity of this process?