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.
1 class Solution { 2 public int firstUniqChar(String s) { 3 int freq[] = new int[26]; 4 for (int i = 0; i < s.length(); i++) { 5 freq[s.charAt(i) - ‘a‘]++; 6 } 7 8 for (int i = 0; i < s.length(); i++) { 9 if (freq[s.charAt(i) - ‘a‘] == 1) { 10 return i; 11 } 12 } 13 return -1; 14 } 15 }
First Unique Character in a String
原文：https://www.cnblogs.com/beiyeqingteng/p/10586829.html