NZEC Error - tip

Betlista_sof 2010-10-19 14:50:46 UTC #1

Hello,

I was solving problem 11. Factorial and had this error.

Problem was in my main method - when there I had

public static void main(String[] args) throws Exception {
    ...
}

I got the error, when I changed it to

public static void main(String[] args) {
    try {
        ...
    } catch ( Throwable t ) {
        t.printStackTrace();
    }
}

it's working fine...

In Java world these two are almost the same, but for the judge it's NOT

Maybe it helps someone else too

TripleM_sof 2010-10-19 21:33:17 UTC #2

Of course they're not the same - Java can easily throw things other than Exceptions. The most common one being a StackOverflowError; for example, if you have a recursive function that tries to recurse too many times, it won't be caught by your first piece of code.

Of course, you shouldn't have declared such a recursive function in the first place, and then it wouldn't matter which piece of code you used

Betlista_sof 2010-10-25 17:03:13 UTC #3

DId I tell that? No, I told, that it's almost the same. Specially in case there is no exception (or Error) thrown, but SPOJ compiler/judge have problem with that...

japi 2010-10-25 21:46:36 UTC #4

Exception in thread "main" java.io.IOException: No such file or directory
	at java.io.FileInputStream.close0(Native Method)
	at java.io.FileInputStream.close(FileInputStream.java:259)
	at java.io.BufferedInputStream.close(BufferedInputStream.java:451)
	at sun.nio.cs.StreamDecoder.implClose(StreamDecoder.java:358)
	at sun.nio.cs.StreamDecoder.close(StreamDecoder.java:173)
	at java.io.InputStreamReader.close(InputStreamReader.java:182)
	at java.io.BufferedReader.close(BufferedReader.java:497)
	at Main.main(Main.java:17)

Your program has just a bug and throws an exception.

There is a difference in value returned by program. When you catch an exception that gives you 0 (like there is no error).

Yes, I know, the biggest SPOJ's problem is that it doesn't accept any sent solution

hlustosa 2011-05-22 16:57:33 UTC #5

As I could understand, the Betlista code throws an error, not an exception. So it's was not catch by the first piece of code, but it was catch the second.
The funny thing is that accordingly to Betlista, the code works. It means that the error thrown didn't affected the program output.

I'm facing a similar problem. I got NZEC when I use (catch Expection), and I got WA when I use (catch Throwable). It means my code is throwing and Error. O.o