leetcode学习笔记33

387. First Unique Character in a String

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

class Solution {
    public int firstUniqChar(String s) {
            int[] count=new int[26];
            for(int i=0;i<s.length();i++){
                count[s.charAt(i)-'a']++;
            }
            for(int i=0;i<s.length();i++){
                if(count[s.charAt(i)-'a']==1)
                    return i;
            }
            return -1;
   }
}