Graphs Practice

I am a beginner in coding .Will you suggest some easy questions on online judges to start with practising graphs and trees.

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http://www.careercup.com/page?pid=trees-and-graphs-interview-questions and http://regentsprep.org/Regents/math/ALGEBRA/APR4/PracTre.htm …hope this will help you

Not really answering your question (as I dont have much experience with graphs either) but check out the topcoder tutorials on graphs http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=graphsDataStrucs1