I am new to competitive programming.Just starting to solve problem in UVa and participating in codeforces contest.Is there any online judge that has categorized problems.Also can any one suggest me what type of problems should i start first.
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You can find categorized problems on hackerrank or you could solve Div.2 problems from past contests.
It'd be a good start if you could read the book Competitive Programming. The first 2 ones are for free on internet. The third one is much better, but if you can't afford it, at least you have the other ones. In this book you have not just categorized problems from uva, but explanation of algorithms, data structures, technics, etc. It has helped me a lot.