boss
I wa7..........
I want data
zhangxiao19901124@gmail.com

Now Wa 10......


Can somebody E-mail me an AC program,I want to Find out the problem! Thanks a lot

zhangxiao19901124@gmail.com

You can try use int64.
I use extended at first,but Wrong answer.
And use int64,I get AC.

Just compare it with brute force solution for first 10'000'000 values. Also check that values 10, 100, 1000, 10'000, ..., 10^18 come in ascdending order - this way you'll check for overflow.

Signed int64 is enough here if you perform no redundant additions/multiplications (i.e. if resulting values only increase during execution).