leetcode[First Unique Character in a String]//待整理多种解法
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解法一：
public class Solution {//要寻找在字符串中只出现一次的第一个字符的位置，就用Map来统计//然后遍历字符串，找出第一个只出现一次的字符 public int firstUniqChar(String s) { HashMap<Character, Integer> map = new HashMap<>(); //统计字符串的map for(int i = 0; i < s.length(); i++){ char c = s.charAt(i); if(map.containsKey(c)){ map.put(c, map.get(c) + 1); } else{ map.put(c, 1); } } //遍历map找出第一个只出现一次的字符 for(int i = 0; i < s.length(); i++){ if(map.get(s.charAt(i)) == 1){ return i; } } return -1; }}阅读全文
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