Select a random number from stream, with O(1) space | GeeksforGeeks 1) Initialize ‘count’ as 0, ‘count...

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Select a random number from stream, with O(1) space | GeeksforGeeks

1) Initialize ‘count’ as 0, ‘count’ is used to store count of numbers seen so far in stream.

2) For each number ‘x’ from stream, do following

…..a) Increment ‘count’ by 1.

…..b) If count is 1, set result as x, and return result.

…..c) Generate a random number from 0 to ‘count-1′. Let the generated random number be i.

…..d) If i is equal to ‘count – 1′, update the result as x.

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Select a random number from stream, with O(1) space | GeeksforGeeks

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