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    This comment is hidden because it contains spoiler information about the solution

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    I've tried my code several times and it didn't get an error. It's possible the error comes from your code in some cases that random tests do not always generate. Can you post your code with a spoiler flag so someone can check what's going on?

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    in C, I have got "munmap_chunk(): invalid pointer" error and after multiple attemp of the same code it work