Problems from 2016 Greater New York Region ACM Regional Contest

Languages
A Mazing!0.096104503114725%5.5Harden
A Rational Sequence (Take 3)0.00861842141377%1.8Easyen
DA-Sort0.01105152971046%3.4Mediumen
FBI Universal Control Numbers0.00339135774355%2.3Easyen
Magical Mystery Knight's Tour0.0024311686775%9.5Harden
Permutation Descent Counts0.0011194663968%2.0Easyen
Smoothed Gardens0.0325922303013%8.7Harden
Tight-Fit Sudoku0.00113237514338%4.5Mediumen
Which Base is it Anyway?0.00572731105539%2.8Mediumen
m-ary Partitions0.0019487639545%3.7Mediumen