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Depth-first search (DFS) is an algorithm for traversing or searching tree or graph data structures. One starts at the root (selecting some node as the root in the graph case) and explores as far as possible along each branch before backtracking.
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Yet another graph search
In my option it would be nicer to have an enum for the strategy rather than a String. This would only allow valid input and any developer using your class would know what strategys are supported witho …