When to use BFS:

图的遍历Traversal in Graph

  • 层级遍历Level Order Traversal

  • 由点及面Connected Component

  • 拓扑排序Topological Sorting

最短路径Shortest Path in Simple Graph

  • 仅限简单图求最短路径即,图中每条边长度都是1,且没有方向

When to use DFS:

求所有方案时

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