LeetCode 387. First Unique Character in a String

Problem:

Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.

 

Examples:

 

s = "leetcode" return 0.

s = "loveleetcode", return 2.

 

-Summary-

1. Create a dictionary to save each character count in 's'

2. Using for loop, if we find any index of character's count is 1, then we return the index value. 

   (After loop is done, if answer not found return -1)

 

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