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how have you resolved the problem?

how have you resolved the problem ?

Well, I had different answers for some of the inputs, so I debugged why they were different/wrong.
After I fixed these I got accepted.

but did you use backtracking?, can you send me your code please?

DIR EN GREY wrote:nooooo!!! I found my mistake... I'm stupid... and get accept.

I got wa many times, and I made many test cases. I'll show that here, I wish these help someone...

last case is very critical data for my code... jesus...

good luck

I spent some days on this problem but always WA. At first, I compared output of my program to uDebug and found some differences, I changed my code again and again according to the "Right Answer", but the only result of submit was WA. What I hadn't expected was that the solution on uDebug is wrong! After visited the post above, I modified my program and got AC finally. THANK YOU, DIR EN GREY! So, beware of that the sulution on uDebug is not allways right.