## How do you implement a DFS?

The DFS algorithm works as follows:

- Start by putting any one of the graph’s vertices on top of a stack.
- Take the top item of the stack and add it to the visited list.
- Create a list of that vertex’s adjacent nodes.
- Keep repeating steps 2 and 3 until the stack is empty.

**Which data structure is used in implementation of depth first search?**

Stack data structure

Depth First Search (DFS) uses Stack data structure.

### What is used to implement BFS?

The data structure used in BFS is a queue and a graph. The algorithm makes sure that every node is visited not more than once.

**How is depth first search different from breadth first search?**

BFS(Breadth First Search) uses Queue data structure for finding the shortest path. DFS(Depth First Search) uses Stack data structure. 3. BFS can be used to find single source shortest path in an unweighted graph, because in BFS, we reach a vertex with minimum number of edges from a source vertex.

#### How is DFS iterative implemented?

Algorithm:

- Created a stack of nodes and visited array.
- Insert the root in the stack.
- Run a loop till the stack is not empty.
- Pop the element from the stack and print the element.
- For every adjacent and unvisited node of current node, mark the node and insert it in the stack.

**What is best first search in AI?**

Best First Search is an algorithm for finding the shortest path from a given starting node to a goal node in a graph. The algorithm works by expanding the nodes of the graph in order of increasing the distance from the starting node until the goal node is reached.

## How is depth first search different from Breadth First Search?

**Which search is implemented with an empty first in first out queue?**

Discussion Forum

Que. | Which search is implemented with an empty first-in-first-out queue? |
---|---|

b. | Breadth-first search |

c. | Bidirectional search |

d. | None of the mentioned |

Answer:Breadth-first search |

### What is difference between BFS and DFS?

**Which is better depth first or breadth first?**

BFS is better when target is closer to Source. DFS is better when target is far from source. As BFS considers all neighbour so it is not suitable for decision tree used in puzzle games. DFS is more suitable for decision tree.