This is not a topic of Volume I. So you should submit this type of topics in Algorithm section.

...and if you want classified problems list, then go to:

ShyGypsy / Igorâ€™s Tools and use "Search query:" text box at top-left of the page.

This is a rich site for ACM solver. you can use other useful features of this page like: next2solve, problemStats, and diff - text box.

By searching with keyword "base" i found the problems below-

grep+: UVA problems keyword search (v1.1)

grep+ found these files to match your search:

p11180.cpp: //easy, base conversion, complex numbers

p575.cpp: //easy, math, number theory, skew binary, base conversion, horner, short, good, excellent, tiny

p10677.cpp: //medium, math, number theory, horner's rule, base conversion, good, excellent

p636.cpp: //easy, good, short, math, number theory, horner, bases, squares, sqrt

p10019.cpp: //easy, trivial, math, horner, bases, bit counting, good

p10764.cpp: //medium, math, bases, signed digit number system, good, educational, gotcha

p10093.cpp: //easy, math, number theory, horner's rule, modular arithmetic, bases, divisibility, good

p173.cpp: //easy, parsing, graphs, simulation, bad, UNSOLVED: another fucked up graph-based simulation

p377.cpp: //easy, calculations in base 4, math

p10442.cpp: //medium, parsing, math, bases, horner, tricky

p10473.cpp: //easy, io, base conversion, scanf, trivial

p11121.cpp: //easy, trivial, math, base conversion

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12 results match.

grep+ searches the database of Valladolid problems that I solved (or tried to). You can give it keywords like "dp", "graphs", "math", "brute force", etc. and it will give you a list of problem numbers that (in my opinion) match the keywords. The database contains 1227 problems.

Please ignore anything that appears after "UNSOLVED:". As you probably know, not being able to solve a problem after many attempts can be very frustrating.