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What is the difference between depth-first search and breadth-first search?

Depth-first search (DFS) explores as far down a branch as possible before backtracking, while breadth-first search (BFS) explores all neighbors at the current depth before moving deeper.

Depth-first search (DFS) and breadth-first search (BFS) are two fundamental algorithms used for traversing and searching tree or graph data structures. Each algorithm employs a different approach to exploring nodes, leading to distinct behaviors and applications. DFS explores a graph or tree by diving deep into a branch until it reaches a leaf node or an unvisited node, at which point it backtracks to explore other branches. This approach can be implemented using recursion or an explicit stack data structure. The key characteristic of DFS is that it goes as deep as possible along a branch before backtracking, making it particularly well-suited for problems that require exploring all possible paths, such as finding connected components or solving puzzles like mazes. On the other hand, BFS explores all neighbors of a node before moving on to the next level of nodes, using a queue data structure to manage the order of exploration. BFS is particularly effective for finding the shortest path in unweighted graphs, as it guarantees that the first time it reaches a node, it has found the shortest path to that node. Understanding the differences between DFS and BFS is crucial for selecting the appropriate algorithm based on the problem at hand. For instance, while DFS may be preferred for scenarios where memory usage is a concern or where all paths need to be explored, BFS is often chosen when the shortest path needs to be found in graph-based applications.

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