Codeforces #677 Div 3 - Unofficial Editorials

A. Boring Apartments
https://youtu.be/EFpBsLCIQPA

B. Yet Another Bookshelf
https://youtu.be/L30oLOqW8gs

C. Dominant Piranha
https://youtu.be/twu7O2p048M

D. Districts Connection
https://youtu.be/GqiONcdm8Oo

E. Two Round Dances
https://youtu.be/E_K3rSqsNLA