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I have recently tried a problem,my code run well on the cases it presented as sample input however failed when I submitted, and I still haven’t found the bugs. So I really hope to have some online-judges who give me all the test cases its engine use so that I can know the details when it reports such like WA, RE, OLE.Or It can give me a report at least telling me the code fails on which test cases.
Topcoder provides all the test cases. You can also check other people’s solutions. It’s a bit difficult to get started in Topcoder though. You’ll need to run a java applet to practice / participate in Topcoder competitions. You can find the applet on top left of the page under the icon O(n). You can check the forum for more help.