Top 10 Interview Questions on Depth First Search (DFS)

Depth-first search (DFS) is an algorithm for traversing or searching tree or graph data structures. One starts at the root (selecting some arbitrary node as the root in the case of a graph) and explores as far as possible along each branch before backtracking. Here are some important DFS problems asked in Technical Interviews: 

1. Find number of islands
2. Transitive closure of a graph using DFS
3. Application of DFS
4. Detect cycle in an undirected graph
5. Longest path between any pair of vertices
6. Find a mother vertex in a graph
7. Iterative Depth first traversal
8. Print all path from a given source to a destination
9. Stepping Number
10. Maximum product of two non- intersecting paths in a tree

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