A Number Theory
B A Gentlemen's Agreement
C Aragorn  
D Little Red Riding Hood  
E An Easy Task  
F A Graph Problem  
G The Good Old Times  
H Permutation Representation  
I Points  
J Euler's Totient Function 

problems at the UVA ONLINE JUDGE, numbers 11064-11073.

Resolvidos:

OK - A Number Theory - aritmético
OK - B A Gentlemen's Agreement - backtracking (chegando ao "final do backtracking" apenas com estados aceitos)
     C Aragorn
OK - D Little Red Riding Hood - programação dinâmica
OK - E An Easy Task - geométrico
OK - F A Graph Problem - programação dinâmica
OK - G The Good Old Times - parsing
OK - H Permutation Representation - Segment Tree(ST) ou Binary Indexed Trees(BIT)
OK - I Points - geometrico ( convex hull + point in polygon )
     J Euler's Totient Function