current_key = int(input().strip())
backup_key = int(input().strip())
for thief_key in range(0, 9999):
    if current_key == thief_key:
        print("yes")
        break
    if thief_key > current_key or thief_key > backup_key:
        print("no")
        break
    temp_key = backup_key
    backup_key = current_key
    current_key = temp_key

It passes tests with "0001/0000" -> no and "0002/0001" -> yes.
And I traced it, it works right.
But they said, that I have wrong answers.
Why?

P.S. Mistake of course was in the line:
if thief_key > current_key or thief_key > backup_key:

I should use and instead or.

Edited by author 24.09.2013 01:56