FLOW018 - Editorial

Problem Link - Small Factorial Practice Problem in 500 to 1000 difficulty problems

Problem Statement:

Write a program to find the factorial value of any number entered by the user.

Approach:

Since N can range from 0 to 20, we need a straightforward way to compute the factorial for each N in a single test case. Here’s how we can approach the problem:

  1. Iterative Computation:
  • Use a loop to compute the factorial iteratively. Initialize the result as 1 and multiply it by each integer from 1 to N.
  1. Handling Special Cases:
  • 0! is defined as 1. This needs to be considered as a special case to avoid errors in computation.

Complexity:

  • Time Complexity: O(N) for each computation of N!.
  • Space Complexity: O(1) No additional space other than variables used for computation.