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leetcode387

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.
找出第一次出现的不重复的字符
public class Solution {    public int firstUniqChar(String s) {        //97-122        int[] map = new int[123];        int i=0;        int length = s.length();        for(i=0;i<length;i++)        {            map[s.charAt(i)]++;        }        for(i=0;i<length;i++)        {            if(map[s.charAt(i)] == 1)                return i;        }        return -1;    }}

除了两次for循环,暂时没有想到N时间复杂度的解法。

leetcode387