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First Unique Character in a String


Problem


Find the first non-repeating character in a given String and return it's index. If it doesn't exist, return -1.

Solution

We can execute the logic in two steps
  1. Find the frequencies of every letter how many times they appear in the string
  2. Using those frequencies find the the first letter which has value as 1

We need to use a Map to keep track of the first index of a letter and separate storage to maintain the frequency count.

Example code is as below:

Comments

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