First Unique Character In a String || leetcode || Python || (Hindi) #5
Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.
Example 1:
Input: s = "hello"
Output: 0
Example 2:
Input: s = "codecmania"
Output: 1
Example 3:
Input: s = "wwoo"
Output: -1