For Q2 "Bitwise X-OR" operation of all input numbers does the trick.
--- On Thu, 9/6/11, Dumanshu <duman...@gmail.com> wrote:
From: Dumanshu <duman...@gmail.com>
Subject: [algogeeks] MS Interview
To: "Algorithm Geeks" <algogeeks@googlegroups.com>
Date: Thursday, 9 June, 2011, 9:45 AM
Q1. I have a file in which there are supposed to be 4 billion
numbers,
starting from 1 to 4,000,000,000 but unfortunately one number is
missing,
i.e there are only 3,999,999,999 numbers, I need to find the missing
number.
Q2. I have an array consisting of 2n+1 elements. n elements in it are
married, i.e they occur twice in the array, however there is one
element
which only appears once in the array. I need to find that number in a
single pass using constant memory. {assume all are positive numbers}
Eg :- 3 4 1 3 1 7 2 2 4
Ans:- 7
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