How answers are checked?

[kwedeer]

as I can guess - by simple comparison of output from submitted program to expected result on some input test data, but - how accurately this comparison is done - e.g. - is it important that output of my program ends with newline (and - from the content of task it is hard to guess whether such newline is expecte or not) or not?

[misof]

If not stated otherwise in the problem description, you have to produce a char-by-char identical output as the author's program. Most important issues:
- each line ends with a newline (use writeln)
- no unnecessary spaces at the beginning/end of the lines