I used ideone for the first time and it did help . My code for MOU1H which was recursive was working fine on my machine for very large input . So to check why it is giving runtime error on codechef judge , I used ideone and it gave StackOverflow error . Then i wrote iterative version which ran perfectly on local machine , ideone and got accepted by Code Chef judge .
So one can’t argue the usefulness of ideone , since it is run by SPOJ which is the backend of Code Chef judge . It kind of helps to run your program there and see errors .
However you should note the follwing post in ideone FAQ’s
Visibility of a submission - what’s that?
Visibility determines how a submission is visible on ideone.com and who can access it. Possible values are:
public - everyone has access to the submission and it is visible on the recent page;
private - everyone has access to the submission and it is not listed on the recent page;
user's - only author has access to the submission and the submission is not listed on the recent page. To use this level of visibility you have to be logged in.
The "private" visibility option is quite misleading by its name .
Everyone who uses ideone for a submission should take care of this
It might also be useful to read other FAQ's :
@sikander_nsit says his solution got copied even when marked with "user's" visibility option . I would appreciate if any one could tell me whether my solution was also copied by someone . Meanwhile to be able use "user's" visibility option you need to be logged in . @sikander_nsit , were you logged in ideone.com when you ran your solution at ideone ??