Medium-Hard Analyze Recursion & Backtracking open_ended

How does the Trie improve Word Search II (LC 212) compared to running LC 79 for each word?

Analyze — Tests ability to break down and examine complex problems.

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This question is from the Recursion & Backtracking topic (Algorithms).

What is the recursion base case for Combination Sum (LC 39)?

What does the 'un-choose' step in backtracking accomplish?

For Letter Combinations of Phone Number (LC 17) with input '23', how many combinations are there?

What is the key difference between permutations and combinations in backtracking?

In backtracking, why must you push `[...path]` instead of `path` to the result?