Reminder: in case of any technical issues, you can use the lightweight website m1.codeforces.com, m2.codeforces.com, m3.codeforces.com. ×

 
 
 
 
Expert

ducdien2267

つ( ͡° ͜ʖ ͡°)つ Duc Tran, Hưng Yên, Vietnam