I used the same code

Your question is incorrect without code.  In C++ 11, there are a lot of new features.
Maybe just performance improvement of C++11 over earlier versions gives you AC.
Look for example for string class.  In C++98, strings are much slower,  than modern strings.

Your AC code runs in 800ms.  Mine just in 240.
http://acm.timus.ru/status.aspx?space=1&num=1613&author=201928
You can made a lot of optimizations.
After those optimizations,  you will get no TLE on G++4.9.