Medium-Easy Remember Recursion & Backtracking Multiple Choice

Time complexity of generating all permutations of n distinct elements?

Remember — Tests recall of fundamental facts and definitions.

Answer Options

A O(n!)

B O(n * n!)

C O(2^n)

D O(n²)

Get the answer with a detailed explanation, plus practice 32+ more Recursion & Backtracking questions with adaptive quizzes and timed interviews.

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?