思路及解答暴力遍历(不推荐)
过双重循环检查每个字符是否只出现一次。javapublic class Solution {public int FirstNotRepeatingChar(String str) {if (str null || str.length() 0) return -1;for (int i 0; i < str.length(); i) {char currentChar str.charAt(i);boolean isUnique true;// 检查…
2026/7/1 1:47:46