Could you please tell me when to use BFS or DFS if the problem can be solved both by BFS and DFS ?
Cycle Detection Using DFS
If problem can be solved by both BFS and DFS you can use any one of them as, both have same time complexity so, no difference.
In general
BFS we use when we have to reach nodes in increasing order of distance from the source node.
DFS we use when you don’t use BFS! 
( when it’s not needed to move in bfs criteria)
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