Define a new class named UnweightedGraphFindCycle thatextends UnweightedGraph with a new method for finding a cycle starting atvertex u with the following header:public List<Integer> getACycle(int u);The method returns a List that contains all the vertices in a cycle starting fromu. If the graph doesn’t have any cycles, the method returns null. Describe thealgorithm in pseudocode and implement it.

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