An easier way to find easy problems in the UVa Online Judge is to use Steven Halim's World of Seven website. His website can be easily searched through Google. Figure 1 shows an excerpt from his website.
Figure 1. Illustration from World of Seven website for finding easy problems.
From Figure 1, we see that some problems are rated 7.0, 8.0, 2.0, 5.5, 2.5, etc. Generally, the lower the rating the easier the problem is. So if you want to find an easy problem, choose a rating number that is as close to 0 as possible.