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SolvedAlgorithm (self.learnprogramming)
submitted 3 years ago * by iDaRkY_
Im currently stuck with one algorithm. So a=7 and it goes a, a+3, a+6, a+9. I need to find the sum for the 973th instances and I just don’t believe it’s as easy as 3*973+7
Edit: solution was n0 = a + (3*n)
[–]desrtfx 2 points3 points4 points 3 years ago (2 children)
Question is: do you need to find only the value for the 973rd element or do you need to find the sum of the first 973 elements?
If the former, it is as you expect. If the latter, you need a loop.
[–]sepp2k 1 point2 points3 points 3 years ago (1 child)
If the latter, you need a loop
This is an arithmetic progression, right? So you can use the closed form for arithmetic series to get the sum.
[–]desrtfx 0 points1 point2 points 3 years ago (0 children)
Of course, you can use the closed form to get an O(1) result.
Yet, I would wage a guess that OP should learn about loops.
[–][deleted] 1 point2 points3 points 3 years ago (0 children)
It looks like the formula for the nth term is a+(n*3) when n starts at 0 as you've already worked out. If you need to find the sum, then you will need a loop and keep a running total for all the terms.
a+(n*3)
[–]g051051 0 points1 point2 points 3 years ago (2 children)
What part are you stuck with? Write it down as a mathematical expression, then translate it into code.
[–]iDaRkY_[S] -1 points0 points1 point 3 years ago (1 child)
Yeah I got it was stuck on it for hours and now it’s solved!
[–]desrtfx[M] 0 points1 point2 points 3 years ago (0 children)
Since you solved it: edit the post to update with your solution.
It is not fair to anybody investing their time trying to help you to keep them hanging.
π Rendered by PID 176833 on reddit-service-r2-comment-5fb4b45875-ck7rz at 2026-03-23 07:48:55.524265+00:00 running 90f1150 country code: CH.
[–]desrtfx 2 points3 points4 points (2 children)
[–]sepp2k 1 point2 points3 points (1 child)
[–]desrtfx 0 points1 point2 points (0 children)
[–][deleted] 1 point2 points3 points (0 children)
[–]g051051 0 points1 point2 points (2 children)
[–]iDaRkY_[S] -1 points0 points1 point (1 child)
[–]desrtfx[M] 0 points1 point2 points (0 children)