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project_euler/problem_002/sol3.py
48 строк
980 B
Michael D
Fix style of the first ten solutions for Project Euler (#3242)
25 окт 2020, 06:23
Не верифицирован
25 окт 2020, 06:23
98e9d6b
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""" Project Euler Problem 2: https://projecteuler.net/problem=2 Even Fibonacci Numbers 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. References: - https://en.wikipedia.org/wiki/Fibonacci_number """ def solution(n: int = 4000000) -> int: """ Returns the sum of all even fibonacci sequence elements that are lower or equal to n. >>> solution(10) 10 >>> solution(15) 10 >>> solution(2) 2 >>> solution(1) 0 >>> solution(34) 44 """ if n <= 1: return 0 a = 0 b = 2 count = 0 while 4 * b + a <= n: a, b = b, 4 * b + a count += a return count + b if __name__ == "__main__": print(f"{solution() = }")