Project Euler 20
Project Euler 20 Information Guide
About to Project Euler 20
In this video, I will be coding the solution for the problem # Adding up all the digits in 100! (factorial, not yelling the number). Videos going forward should be in 1440p 60fps if all goes right. n! means n x (n-1) x ... x 3 x 2 x 1. For example, 10! = 10 x 9 x ... x 3 x 2 x 1 = 3628800, and the sum of the digits in the number 10! In this one we are basically just combining a few basic concepts we have already covered previously so this one is really quick. I mean BigInt just melts this one. It's perhaps against the spirit of I use the Big Integer class from the last two videos to solve
Short and sweet; like that one girl in college you should've asked out, or shortbread cookies Factorial Digit Sum. Please ! Leave comments and questions in the comment section below. In this video we use graph theory and knowledge of a famous NP-complete problem to tackle the first problem from
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Last Updated: June 10, 2026
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