Project Euler problem 65

。。水题。

直接模拟这个过程即可

arr = []arr.append(2)for i in range(1, 50):arr.append(1)arr.append(2 * i)arr.append(1)up = 1now = 99down = arr[now]for i in range(now - 1, -1, -1):ta = arr[i] * down + upup = downdown = tasum = 0up = downwhile up:sum += up % 10up /= 10print sum