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This video explains a very interesting programming interview question which is to find the first non-repeating character in a string. The problem is simple but has repeated in numerous interviews. I have shown the intuition for solving this problem with proper examples and algorithm. We can solve this problem using an array or hash or map etc. data structures. I have shown the solution using simple array in just O(N) time and O(1) extra space. CODE LINK for this is given in the description below. I have also given link for similar problem variants ransom note and first non repeating character in a stream of characters. If you find any difficulty or have any query then do COMMENT below. PLEASE help our channel by SUBSCRIBING and LIKE our video if you found it helpful...CYA :)


CODE LINK: https://gist.github.com/SuryaPratapK/...
SIMILAR PROBLEMS:-
First non-repeating character in a stream of characters:    • First non repeating character in a stream ...  
Ransom Note:    • Ransom note | Leetcode #383  
First unique number:    • First unique number | Leetcode