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Factorial
Basic Accuracy: 59.08% Submissions: 5396 Points: 1

Given a positive integer, N. Find the factorial of N.
 

Example 1:

Input:
N = 5
Output:
120
Explanation:
5*4*3*2*1 = 120

Example 2:

Input:
N = 4
Output:
24
Explanation:
4*3*2*1 = 24


Your Task:
You don't need to read input or print anything. Your task is to complete the function factorial() which takes an integer N as input parameters and returns an integer, the factorial of N.

 

Expected Time Complexity: O(N)
Expected Space Complexity: O(1)

 

Constraints:
1 <= N <= 18

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Factorial

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