Daily Archives: October 7, 2015

First non-repeating or unique character in a stream of characters

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Given a stream of characters, find the first non-repeating i.e. unique character occurred.

For example, in a stream [a,c,b,a,d,a,…] first unique is ‘c’ but if another ‘c’ character comes to stream [a,c,b,a,d,a c,…] then first unique would be ‘b’.

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