Problems from Criterion 2021 Round 8

These problems are from a contest hosted on January 15, 2021 at 9:00 AM UTC. See details...

Standings
A. Move It!
Few of my friends are working on a game called “Move It!”. It's a tile-based game played on an $n\ti...
B. Create Some Walls!
Mahdi has finally found some time to build his dream house. He had been looking for some cool design...
C. Equalizing Pillars
There are $N$ pillars made of bricks. The height of each pillar is the number of bricks in that pill...
D. Congruence Problem
Find the number of integer solutions of $ x^2 + 4x + 3 ≡ 0 $ $ (\text{mod } $ $m) $ where $ 0 \leq x...
E. Fabby and Her Wedding Dress
You all remember Fabby, the princess of Byteland. People of Byteland are waiting for the biggest cel...
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