Rounded avatar PrepNotes

Artificial Intelligence

Compare and contrast DFS and BFS.

BFS and DFS Algorithms

Feature BFS DFS
Full Form Breadth First Search Depth First Search
Starting Point Starts from the root node and expands all nodes at the current level before moving to the next level. Starts from the root node and follows each path to its greatest depth node before moving to the next path.
Data Structure Used Queue Stack
Speed Comparatively slower than DFS Comparatively faster than BFS
Memory Usage Requires more memory compared to DFS Requires less memory compared to BFS
Concept FIFO (First In First Out) LIFO (Last In First Out)
Traversal Order According to tree level According to tree depth
Backtracking No need for backtracking Backtracking is required
Infinite Loop Trap Cannot be trapped in infinite loops Can be trapped in infinite loops
Shallowest Path Solution Provides the shallowest path solution Does not guarantee the shallowest path solution
Best for Target Location Closer to the source Farther from the source
Node Visitation Order Siblings are visited before children Children are visited before siblings