java-leetcode面试题解哈希表第387题字符串中的第一个唯一字符-题解.zip

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