Check If String has All Unique Characters
Objective: Write an algorithm to find out whether in a given string contains all the unique characters. This question has been asked in the Amazon and Microsoft interviews.
Input: A String
Output: True or false based upon whether string contains all the unique characters or not.
When characters are not ASCII but could be anything alphabets or special characters
- Create a boolean array of size 256, and put false at every index.
- Navigate the input string one character at a time, say ‘char a’
- Check array position of array[a], if it is false, make it true.
- If it is already true, return false.
Sort the array and do the linear scan to find out whether string contains unique elements or not.
Complete Code for Both Methods:
Output: Method 1 : Does String ' Sumit_Jain ' has all unique characters :false Method 1 : Does String ' Sumit ' has all unique characters :true Method 2 : Does String ' Sumit_Jain ' has all unique characters :false Method 2 : Does String ' Sumit ' has all unique characters :true
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If you find anything incorrect or you feel that there is any better approach to solve the above problem, please write comment.