What does M mean??

when our solution for a particular problem gets accepted …the result shows the memory used is say 0.2M… so what does M stand for?

M stands for Mega Bytes. So, .2M is approximately 200 KB.

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then…how much memory is allowed at max??

M is for mega bytes. 0.2M means 204.8 KB

Max is 64MB

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if ‘M’ means MB then why the below thing happens…its a simple code for beginner ATM problem.