Teaching Assistant solutions

Teaching Assistant was solved using C# by 4 contestants. Solution sizes: average 3035 bytes (shortest: 2257; longest: 4458).

197.

azukun (S, L) (4458 B)
280.

piyawatl (S, L) (2266 B)
281.

Orlangur (S, L) (2292 B)
319.

chokudai (S, L) (3183 B)