### MahmoudSayed's blog

By MahmoudSayed, 8 years ago,

There are 1 billion stars and you are standing at earth. Form the earth you know the distance of all 1 billion stars. Find the nearest 1 million stars from the earth.

Thanks in advance.

• +2

By MahmoudSayed, 8 years ago,

I have 3 numbers A, B, and C. where A = 97830131475, B = 587117 and C = 109546051211. I wanna get A * B (mod C) without overflow using c++. I used this formula:

     unsigned long long x = A % C * B % C;
x %= C;


but still getting overflow. where x = 0.` can someone help me!! Thanks in advance. :)

• +5

By MahmoudSayed, 8 years ago,

I participated in ACM ECPC last year and i got the 95th place. now I'm practicing by solving problems on different online judges and by participating in CF rounds and TC SRMs.. I don't know what should I learn now and what should be my priorities. So, i think that i may need a coach.

• +3