I did the same thing as mentioned in the editorial first making a map of the position of the fence and color .
Then I followed the same procedure as mentioned in the editorial . Still I was getting TLE . It would be great if someone points out the mistake in the given code.


Hey, instead of using cin/cout, try scanf() and printf(), it did the trick for me :slight_smile:

and also I heard somewhere that vectors are marginally slower than arrays, but mainly just try printf(), scanf() hope it thelps

or if u want to use cin and cout, like if ur comfortable with it, then use this line
std::ios::sync_with_stdio(false); under the int main() line of your code.

Note:- After writing this line you can only use cin and cout for i/o. Using scanf and printf after thiss will give you rutime error SIGSEGV.

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It is for fast input/output ofcourse.

I tried using scanf and all the other optimisations but still I got TLE .

I would like to point out that most of the codes getting TLE posted here have actually the correct logic and implementation and I have faced the same problem. The performance issue is note due to the modular arithmetic but due to slow I/O and not that here we have up to 10^5 inputs.

cin, cout are much slower than scanf and printf, to make them faster you have to include this line


at the beginning. For example take my AC solution and TLE solution. Both being exactly the same, I got a 3x performance by including the line above. Hope this helps in future. Kudos !!

Hey check this code. It the AC version of your code. I used this implementation of fast I/O.

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I had tried this actually but then I was getting WA .
It would be great if you once check the code


@goltu…Change the datatype of variable “ans” to long long!!!

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See that the ans could be greater than 10^9, you have to take make your “ans” variable of the type of long long.

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Yes got it . Thankyou :slight_smile: