Project Euler
Here’s the project Euler challenges I’ve done, including my source code. They were done in C++ unless otherwise noted.
Problem 1:
“If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.”
Answer: 233168 (correct)
Time: about 5 minutes, maybe less
Date: Friday 3 February 2012
Problem 2:
“Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …
By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.”
Answer: 4613732 (correct)
Time: about 10 minutes
Date: Friday 3 February 2012
Notes: no functions were made because all calculations were doable in a single line