Which graph traversal visits nodes in level order?

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Multiple Choice

Which graph traversal visits nodes in level order?

Explanation:
Level-order traversal is achieved by breadth-first search. Starting from a source node, you visit all nodes at distance one, then all nodes at distance two, and so on. This orderly, level-by-level exploration is what BFS guarantees, typically using a queue to process nodes in the order they’re discovered so each level is completed before moving to the next. Dijkstra and Bellman-Ford are about finding shortest paths, not the order of visiting every node. DFS, in contrast, goes deep along one path before backtracking, so it doesn’t visit nodes level by level.

Level-order traversal is achieved by breadth-first search. Starting from a source node, you visit all nodes at distance one, then all nodes at distance two, and so on. This orderly, level-by-level exploration is what BFS guarantees, typically using a queue to process nodes in the order they’re discovered so each level is completed before moving to the next.

Dijkstra and Bellman-Ford are about finding shortest paths, not the order of visiting every node. DFS, in contrast, goes deep along one path before backtracking, so it doesn’t visit nodes level by level.

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