Program to Find Duplicate character in a String Coding Interview Question and Answer | Code Decode

In this video of code decode we have covered String coding interview question i.e. Find duplicate character in a string in 3 different ways so please watch this video till the end

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In this video of Program to find duplicate character in a String coding Interview Question and Answers we have explained the program and we have also explained the solution 3 ways


Program to find the duplicate characters in a String in 3 different ways
Using for loops
Worst time complexity -
Time Complexity: O(n2), where n = length of the string passed

Using arrays of 256 size
Time Complexity: O(n), where n = length of the string passed

Space Complexity: O(NO_OF_CHARS)

Using Map
Time Complexity: O(N log N), where N = length of the string passed and it generally takes logN time for an element insertion in a map.

Space Complexity: O(K), where K = size of the map (0=K=input_string_length).


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