I'll be sitting for an Amazon interview in 3 months. Which website should I use to practice: SPOJ, HackerRank, HackerEarth, CodeChef, Codeforces, or UVA?
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12 Answers
GeeksforGeeks is enough. Recently I cleared AMAZON interview (SDE-1) and all the questions are from Geeksforgeeks. and some CS fundamentals (OS,DS,DBMS,Networks).
Practice geeksforgeeks and write clear code on paper. you can practice on leetcode also for handling edge cases and various types of questions.
Topics you should focus -
- Tree traversals and other tree questions.
- simple linked list and array questions.
- BFS,DFS.
- some questions based on graph.
- Dynamic Programming.
- work on your coding skills, Try to write clear and simple codes which are syntactically correct and don't forget to handle all edge cases.
- Time complexity and space complexity of each algorithm, and they can ask proof of that algorithm.
- You have to give optimal solution and code for that.
- If you are applying off campus then there may be a design round so practice some basic design.
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If you want to practice coding questions, the best site I've seen for this is InterviewBit. After that, you can read people's interview experiences on GeeksforGeeks.org and see questions recently asked at companies on Glassdoor.com or CareerCup.com.
Page on geeksforgeeks.org
Programming Interview Questions | CareerCup
Interview Guide - Amazon [E-Book]

Anonymous
Amazon would be having an algorithmic interview. The best way to prepare for that would be to open GeeksforGeeks and CareerCup. Open up the interview corner, you would find plethora of interview experiences for Amazon. Practice those question hard. GeeksforGeeks would be the best place to prepare for it. Go for it in a structured way, e.g. lets say do all array then link lists then trees. Be prepared to devote each and every single amount of your time to this one purpose. I would wish you All the Best. Cheers!!. :)
P.S. I don't want to say that sites you mentioned are useless but these sites are more of a competitive programming practice platform, hence would help out less effective way for Amazon in 3 months of time.
Amazon Archives - GeeksforGeeks
I have done that and cleared the Internship Interview of Amazon.

Anonymous
Every Online judge is somewhat similar to each other. Practice data structures questions from geeksforgeeks and career cup , use spoj and codechef for practice of AdHoc problems and give as much time as you can , you'll succeed definitely . :)
Participate in this coding challenge & stand a chance.
Amazon Developer Hiring Challenge | Developer jobs in April, 2016 on HackerEarth