Discussion
What does uniform cost search expand first?
Answer: A
Ordering the frontier by the cost of the path from the start makes the search expand cheap paths first, which guarantees optimality with any non-negative step costs. Shallowest is breadth first, an estimate to the goal would be a heuristic, and most recent is depth first. Uniform cost is Dijkstra's algorithm arrived at from the search direction, and recognising them as the same algorithm connects two literatures.
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