The below is a search tree, using breadth first search to reach goal Hamera. What is the answer ____.

Question

BlackTom AI · Accepted Answer

Breadth-first search visits nodes level by level, so we must list nodes in the order they are dequeued (visited) until the goal Hamera is found.

1) Relevant knowledge points and concepts
- BFS uses a queue: enqueue the root, then repeatedly dequeue a node, test it for goal, and enqueue its children (left-to-right).
- The goal test is applied when a node is dequeued (visited).
- The search order is therefore root first, then all nodes at depth 1 left-to-right, then depth 2, and so on.

2) Step-by-step reasoning with queue states
- Start: enqueue [Paul].
- Dequeue Paul (visit 1): test (not goal). Enqueue its children left-to-right: [Keith, Meneka, Alisha].
- Dequeue Keith (visit 2): test (not goal). Enqueue Keith’s children: queue becomes [Meneka, Alisha, Ravil, Mike].
- Dequeue Meneka (visit 3): test (not goal). Enqueue Meneka’s child Hamera: queue [Alisha, Ravil, Mike, Hamera].
- Dequeue Alisha (visit 4): test (not goal). Enqueue Philip: queue [Ravil, Mike, Hamera, Philip].
- Dequeue Ravil (visit 5): test (not goal). Queue [Mike, Hamera, Philip].
- Dequeue Mike (visit 6): test (not goal). Queue [Hamera, Philip].
- Dequeue Hamera (visit 7): test — this is the goal; stop.

3) Calculations / intermediate steps
- The explicit dequeue sequence is: Paul → Keith → Meneka → Alisha → Ravil → Mike → Hamera.

4) Why the correct answer is correct
- That sequence exactly follows BFS queue operations and stops when Hamera is first dequeued. It matches option A.

5) Why other options are incorrect (brief)
- B omits Paul (root) as the first visited node — BFS always begins at the root.
- C (Paul, Meneka, Hamera) implies skipping Keith and Alisha at the same level, which contradicts BFS left-to-right level order.
- D (Paul, Keith, Ravil, Mike, Meneka, Hamera) follows a depth-first-like expansion under Keith before visiting Meneka, not BFS.

6) Conclusion
- The BFS visit order up to the goal is Paul, Keith, Meneka, Alisha, Ravil, Mike, Hamera, so option A is correct.

The below is a search tree, using breadth first search to reach goal Hamera. What is the answer ____.单项选择题

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