I used binary operations to solve the problem and I didn't manage make my algorithm faster. My algorithm is too slow (0.015 sec). Could you give me a little advice how I can optimise my algorithm?

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Time is rounded here, so you can only see results like 0.001, 0.015, 0.031, 0.046, 0.062 etc. 0.001 and 0.015 are pretty much equal, and 0.015 can mean pretty much anything between 0.002 and 0.015. Like 0.001, 0.015 is an ideal time, there's nothing to optimize here. Only starting from 0.031 the program might be considered "slightly slow".

Thank you, Jane. It was really important for me. I got crazy of this runtime. It was like a bolt out of the blue xD Good luck!.

Btw, sorry for my English :D

Same thing))