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BFS & DFS : Triversal technique

1. BFS, Breadth First Search

good shortest path, closer nodes
bad more memory

2. DFS, Depth for Search

good less memory, does path exist
bad can get slow

BFS vs DFS

BFS DFS
상황 최단 경로, 가장 가까운 노드 길이 존재하는지 여부
구현 방식 큐(queue) 스택(stack) 또는 재귀 함수
탐색 순서 너비 우선 깊이 우선
탐색 방향 수평 수직
최단 경로 탐색 가능 불가능
공간 복잡도 O(V) (V: 노드 수) O(V) (V: 노드 수)
시간 복잡도 O(V + E) (E: 간선 수) O(V + E) (E: 간선 수)

Quiz

quiz reply answer explain
If you know a solution is not far from the root of the tree. BFS BFS
If the tree is very deep and solutions are rare. DFS BFS DFS will take long if the tree is very deep
If the tree is very wide. BFS DFS BFS will need too much memory
If solutions are frequent but located deep in the tree. DFS DFS
determining whether a path exists between two roads. DFS DFS
Finding the shortest path. BFS BFS

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