Problems from Bangladesh Olympiad in Informatics (BdOI) 2018 Day 2

These problems are from a contest hosted on March 16, 2018 at 2:15 AM UTC. See details...

Standings
A. Notorious Notary
  Notari is very fond of strings. He is currently studying matching pattern in strings. His class te...
B. The Battle of The Snows
Well, as you may have already guessed, this tale is actually about the 2 Snows: Now, they have thei...
C. Alice in Wonderland
Alice likes to play with his friends Bob, Charley and Dave. But her parents want her to study all th...
D. Math Class
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