In this particular question, the time limit of 2.5 seems to be very strict. I believe so because I can see that a lot of people have submission times of between 2 and 2.5. Also I can see the same user getting TLE multiple times within a short span of time and then able to adjust the constant factor and make it AC. I personally also got TLE in 3-4 cases out of 20. I feel that the time limit should be raised to 3.5 sec so that we don’t waste time in optimizing constant factors.
P.S: In case seniors/pros/problemsetter(@watcher) believe I am wrong, then please ignore 
There is a solution in 0.4-0.5 seconds 
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