link the questions based on trees and graphs and sorting

general
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1

Hey please give name or links to questions on trees,graphs and sorting.

2

http://learn.hackerearth.com/questions/?type=Trees+and+Graphs Here are some good questions based on trees and graphs!
Solve Algorithms | HackerRank This is another one!

3

One of the fellow users started a thread to collect resources for each topic in a single place. See this thread.