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Program to find if string has all unique character without using additional data structure

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Program to determine if a string has all the unique characters? What if you can not use additional data structure. Asked in Microsoft interview. Language used C#. Algorithm Complexity : O(n).

http://knowsh.com/Notes/NotesSearch/NotesDetail/130197/Program-To-Find-If-String-Has-All-Unique-Character

 

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