I was solving problem F of ABC just now. And I got passed with long long, but when I change the type into __int128_t, it got wrong answer in most of the cases. Why is that?
Upd: It is said that __int128_t can not be the index of array. It may cause wrong answer. So it is always not a good idea to use things like #define int __int128_t.
Upd2: I just tested some other things on AtCoder about __int128_t, it seems template<typename> may work incorrectly with __int128_t. That's from my function read(). I searched for many times in Google but have not found why.
