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Was the only change the additional line? I comapred my input/output with that of your program and they are the same, but I get WA. Didn't try to submit your program, though.

Ah, I had an nasty bug in my code, and of all possible input cases (4069), only a few were wrong. And obvious, the judge tested one of them

But there should be an empty line between each case, so \n\n is fine, i guess.

Pavelph, thank you for your reply.

I don't know what is wrong with my program, I tested it with many inputs and I really don't know what to do next. Have you any special-case-rule in your code or can you suggest me any other input/output test?

I am using a graph search algorithm to solve this problem, and I am getting WA, but I don't know why. Here are some input and output cases, can anyone try them with a AC program? Thanks...

Input:
a1 e4
a2 a8
a3 g5
b1 c1
b2 b6
b3 c4
b4 h8
b8 h8
c2 c6
c3 h4
c6 f7
d2 f8
d4 e6
d6 h8
e2 e6
e4 e8
f1 g6 ...

Hey thanks, man, I included stdio.h and it worked OK - I got AC.

I know stdin.h, but didn't know I have to include it. It's maybe the fault of this stupid MS compiler, in which you don't need to include it

I really appreciate your reply.

Oh, sorry. I am getting the compile error only on OJ. At home I use Visual C#, but I am coding in C. And I have a lot of problems accepted, but in this one I am using feof(stdin) and there is where I am getting compile error (if I remove it from the code, it's OK, but then I get WA).

And I didn't ...

Why am I getting compile error if i use:
[c]if(feof(stdin))
return;[/c] ?

Rong, thank you very much for your test cases!

I had a bug and couldn't find it. It was discovered through your test cases...

The bug was: if a cycle started in the first robot position, it was discovered as a cycle starting at the second robot position

yan4546 wrote:2 digits is not enough and 3 digits can do .

Nope, one digit of m and two digits of n are enough.

Got it... changed to unsigned long and it worked...

Hello all!

Why am I getting SIGSEV error with this piece of code?
The largest value in the sequence will not be larger than a 32-bit C long, and I have long's in the code. What else could be wrong?