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Amazon Interview Question for Software Engineer / Developers






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Number = Sum - n*(n+1)/2

- HItesh March 29, 2006 | Flag Reply
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what is dup of a number?

- Java Coder November 26, 2007 | Flag Reply
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Hitesh,

you are assuming that numbers are successive.. so you can calculate sum by n(n+1)/2 but what if numbers are,
1,2,4,6,6,8
so this wont work..
easier solution is to create a hash table for all entries O(n) and then calculate the has to n+1 number.. and lookup with O(1)....

- Mayank April 18, 2008 | Flag Reply
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of 0 vote

Think it is safe to assume there is only one duplicate. That would mean Hitesh's method should work.

- Agent May 02, 2010 | Flag Reply


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