387. First Unique Character in a String

原创
2016/10/16 17:09
阅读数 11

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.

Examples:

s = "leetcode"
return 0.

s = "loveleetcode",
return 2.

 

Note: You may assume the string contain only lowercase letters.

public class Solution {
    public int firstUniqChar(String s) {
        if(s==null||s.length()<=0)
            return -1;
        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;
    }
}

 

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