欧拉工程第二解

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第二解:

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.

解:

1
2
3
4
5
6
7
8
9
10
i = 1
j = 2
sum = 0
while j < 4000000 :
    if j % 2 == 0 :
        sum = sum + j
    t = i
    i = j
    j = t + j
print sum