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I used double, the standard sqrt and I also tried one written by me(with binary search) and the result is the same: Time Limit Exceeded! I understood that the official solution is based on a sqrt function written with binary search. I believe that something has changed in the evaluator. I wonder if ...

After I used all the tricks in this section and also used long long and __int64, I got TLE. I tried to print these types with gcc 4.9.8 and Visual C++ with cout or printf and %lld or %I64d and these functions don't know how to print negative numbers!!! Please tell me where's the mistake.
P.S. What ...