# Tag Info

### What are the differences between uniform-cost search and greedy best-first search?

In the case of UCS, the evaluation function (that is, the function that is used to select the next node to expand) is $f(n) = g(n)$, where $g(n)$ is the cost of the path from the initial node to $n$, ...
Accepted

### What is the difference between hill-climbing and greedy best-first search algorithms?

Let's see their definition first: Best First Search (BFS): ‌ Best-first search is a search algorithm that explores a graph by expanding the most promising node chosen according to a specified ...
• 1,663
1 vote

### How does best-first search differ from hill-climbing?

Best-first search BFS is a search approach and not just a single algorithm, so there are many best-first (BFS) algorithms, such as greedy BFS, A* and B*. BFS algorithms are informed search algorithms, ...
• 34.3k
1 vote

### What does the statement with the max do in the recursive best-first search algorithm?

This is probably more easily understood as the collapse/restore macro. The idea is that the previously explored state was collapsed and only the minimum f-cost from the sub-tree was stored. This ...
• 361
1 vote

### Why is the space-complexity of greedy best-first search is $\mathcal{O}(b^m)$?

I was struggling with the same question. This is what I came up with after thinking it through. With depth-first-search, you backtrack to a node that is a non-expanded child of your parent (or the ...
• 11
1 vote
Accepted

### Why is the space-complexity of greedy best-first search is $\mathcal{O}(b^m)$?

After spending some time on the problem, I concluded that it is due to the fact that we need to store the heuristic function evaluations for all nodes during the traversal. So, one might claim that it ...

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