A  Wacmian Numbers
B  CD Titles
C  Caesar Cipher
D  Water Tanks
E  Spots
F  Mobile Phones
G  Colour Grids
H  Postal Vans
I  Tricky Trees

problems at the ACM ICPC Live Archive, numbers 2731-2739.

Resolvidos:

OK - A  Wacmian Numbers - nike
OK - B  CD Titles - nike
OK - C  Caesar Cipher - nike
OK - D  Water Tanks - guloso
   - E  Spots
OK - F  Mobile Phones - nike
   - G  Colour Grids
   - H  Postal Vans
OK - I  Tricky Trees - sort ( bottom-up )