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It may be an error caused by an invalid memory reference or segmentation fault. The most common causes are accessing an array element out of bounds, or using too much memory!
Some things for you to try:
Make sure you aren’t using variables that haven’t been initialised. These may be set to 0 on your computer, but aren’t guaranteed to be on the judge.
Check every single occurrence of accessing an array element and see if it could possibly be out of bounds.
Make sure you aren’t declaring too much memory. 64 MB is guaranteed, but having an array of size  will never work.
Make sure you aren’t declaring too much stack memory. Any large arrays should be declared globally, outside of any functions - putting an array of 100000 ints inside a function probably won’t work.