![This algorithm is so good, it feels like cheating! [Project Euler | C++]](https://i.ytimg.com/vi/CLD8WU1olQQ/mqdefault.jpg)
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Last Updated: October 16, 2026
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In this video, I will be coding the solution for the problem # Factorial Digit Sum. Please ! Leave comments and questions in the section below. Adding up all the digits in 100! (factorial, not yelling the number). Videos going forward should be in 1440p 60fps if all goes right. I use the Big Integer class from the last two videos to solve In this video, we'll solve Problem 1 from Want my help with your code? the options here: bio.site/problemsolvingwizard Please watch: "CSES problem Increasing Array" youtube.com/watch?v=FiHSPt_cBV0 -~-~~-~~~-~~-~- Today we do some live coding challenges on I mean BigInt just melts this one. It's perhaps against the spirit of 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 video I tackle a problem about cyclic sets of figurate numbers. Have you ever heard of a heptagonal number? We're solving some algorithmics problems from
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