Tell me the concept of Depth-first search

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⚹ Depth-first search (DFS) is an algorithm used for traversing or searching tree or graph data structures. ⚹ ⚹ Here are the key concepts of Depth-first search: ⚹ ‖ ▪ ⋮ **Traversal Method**: DFS starts at the root (or an arbitrary node in the case of a graph) and explores as far as possible along each branch before backtracking. ‖ ‖ ▪ ⋮ **Stack Usage**: DFS uses a stack data structure, either implicitly through recursion or explicitly by using a stack data structure. ‖ ‖ ▪ ⋮ **Visited Nodes**: To avoid cycles and repeated processing of the same node, DFS keeps track of visited nodes. ‖ ‖ ▪ ⋮ **Applications**: DFS is used in various applications such as solving puzzles, pathfinding, topological sorting, and detecting cycles in graphs. ‖ ⚹ Here is a simple example of DFS in pseudocode: ⚹ ```plaintext DFS(node): if node is not visited: mark node as visited for each neighbor in node's neighbors: DFS(neighbor) ``` ⚹ In summary, Depth-first search is a fundamental algorithm in computer science used for exploring nodes and edges of a graph or tree structure. ⚹

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