Problem Statement
Calculate factorial of n.
Approach
n! = n × (n-1)!. Base case: 0! = 1.
Time & Space Complexity
Time O(n), Space O(n).

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Basic recursion example.
Calculate factorial of n.
n! = n × (n-1)!. Base case: 0! = 1.
Time O(n), Space O(n).
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