Especially for tackling the ones that come in ACM-ICPC. Which OJ has the best math(especially number theory) problems, that, will help me master it? Is Codeforces good for mastering the concepts?
Especially for tackling the ones that come in ACM-ICPC. Which OJ has the best math(especially number theory) problems, that, will help me master it? Is Codeforces good for mastering the concepts?
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codeforces not bad
http://codeforces.com/problemset/tags/number%20theory
You can try SPOJ Classifier
Number theory problems
Highly recommend Project Euler. It is, basically, a maths problem-solving site, which has problems from various topics, and also requires programming skills. If your maths skills are somewhere close to Regional, maybe starting with 25% / 30% difficulty is not a bad idea. Of course there are some problems which are not really helpful, especially geometric simulation ones, which prefer to be solved with Mathematica, MatLab etc.- just skip them and move to other problems. The bad thing is, it has no official hints/ editorials, so just don't get stuck at a problem for too long ;)
On the other hand, Codeforces and TopCoder problems are also quite good, especially in probabilities. And they have editorials :)