Java specifications?
All programs must begin in a static main method in a Main class. Do not use public classes: even Main must be non public to avoid compile error.Use buffered I/O to avoid time limit exceeded due to excesive flushing.
excesive flushing 应为 excessive flushing
About presentation error?
There is no presentation error in this oj.The judger will trim the blacks and wraps in your ouput's last line. if it's still different with the correct output, the result will be Wrong Answer.
ouput's last line 应为 output's last line
trim the blacks 应为 trim the blanks
在 FAQ 里：
excesive flushing 应为 excessive flushing
ouput's last line 应为 output's last line trim the blacks 应为 trim the blanks
还有很多标点符号后面的空格也缺失了。