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Problem 2

上一篇 / 下一篇 2009-09-08 10:23:21 / 个人分类：projecteuler题目 ruby实现

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每日随笔

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#   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, ...
#Find the sum of all the even-valued terms in the sequence which do not exceed four million.

=begin
max    =4000000
total = 0
$stack = []

def fib n
if n == 0
    return 1
end
if n == 1
    return 2
end
return $stack[n - 1] + $stack[n - 2]
end

max.times do |i|
$stack[i] = fib i
if $stack[i] > max
    break
end
if $stack[i] & 1 == 0
    total += $stack[i]
end
end
puts total
=end

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