algorithm/JavaScript
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/JavaScript.git synced 2025-07-20 10:37:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

Remove live code & console.log, leave examples as comments (ProjectEuler, Recursive).

Browse Source
This commit is contained in:
Eric Lavault
2021-10-10 18:18:25 +02:00
parent 9212e6d684
commit 5f45b540b9
17 changed files with 48 additions and 98 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Project-Euler/Problem2.js
View File

@ -4,10 +4,9 @@ const PHI = (1 + SQ5) / 2 // definition of PHI
// theoretically it should take O(1) constant amount of time as long
// arithmetic calculations are considered to be in constant amount of time
const EvenFibonacci = (limit) => {
export const EvenFibonacci = (limit) => {
const highestIndex = Math.floor(Math.log(limit * SQ5) / Math.log(PHI))
const n = Math.floor(highestIndex / 3)
return ((PHI ** (3 * n + 3) - 1) / (PHI ** 3 - 1) -
((1 - PHI) ** (3 * n + 3) - 1) / ((1 - PHI) ** 3 - 1)) / SQ5
}
console.log(EvenFibonacci(4e6)) // Sum of even Fibonacci upto 4 Million