I checked the 1st and 3rd test case and if I understood well the problem, they must be wrong.
1st case: with 1 digit we have 2 numbers with only zeros or sevens: 0 and 7, but in the text 1 is the right answer.
3rd case: with 1 digit 0 and 7, with 2 digits 70 and 77, with 3 digits 700, 707, 770 and 777 (8 numbers at all, but the right output according to the text is 12.
Correct me if I'm wrong.
Thank you in advance.
05.09.2012
Wrong test cases on Sevens (2nd problem, Final Round 2009)
