Arafat Hasan Jenin <opendoor.arafat[at]gmail[dot]com>
From Rangpur, Bangladesh

My IDs in various problem solving platforms

Codeforce: arafat_hasan
Uva: arafat_hasan
HackerRank: arafat_hasan
Codechef: arafat_hasan
SPOJ: arafat_hasan
Top Coder: arafat_hasan

usernames in other platforms

Stackoverflow: arafat_hasan
GitHub: arafat-hasan
Linkedin: arafat-hasan
Facebook: arafathasanjenin
Twitter: Arafat_HJ